Ubuntu recognize 4gb out of 8gb ram

nikos@nikos-MS-7588:~$ uname -m
x86_64
thats what i got :/

i open the command console, type in gnome-control-center and at the system tab i click on details. Then at the overview tab it shows the Device name and beneath it it says memory. Also i see the same thing exactly if i go to the application tab at the left top corner go to system tools sysinfo and then again by clicking the memory tab

thats what i got using the commands u wrote skittle
nikos@nikos-MS-7588:~$ cat/proc/meminfo
bash: cat/proc/meminfo: No such file or directory
nikos@nikos-MS-7588:~$ sudo dmidecode --type memory
# dmidecode 2.11
SMBIOS 2.6 present.

Handle 0x0008, DMI type 5, 24 bytes
Memory Controller Information
Error Detecting Method: 64-bit ECC
Error Correcting Capabilities:
None
Supported Interleave: One-way Interleave
Current Interleave: One-way Interleave
Maximum Memory Module Size: 8192 MB
Maximum Total Memory Size: 32768 MB
Supported Speeds:
Other
Supported Memory Types:
DIMM
SDRAM
Memory Module Voltage: 3.3 V
Associated Memory Slots: 4
0x0009
0x000A
0x000B
0x000C
Enabled Error Correcting Capabilities:
None

Handle 0x0009, DMI type 6, 12 bytes
Memory Module Information
Socket Designation: DIMM1
Bank Connections: 0 1
Current Speed: Unknown
Type: DIMM SDRAM
Installed Size: 4096 MB (Double-bank Connection)
Enabled Size: 4096 MB (Double-bank Connection)
Error Status: OK

Handle 0x000A, DMI type 6, 12 bytes
Memory Module Information
Socket Designation: DIMM2
Bank Connections: 2 3
Current Speed: Unknown
Type: DIMM SDRAM
Installed Size: Not Installed
Enabled Size: Not Installed
Error Status: OK

Handle 0x000B, DMI type 6, 12 bytes
Memory Module Information
Socket Designation: DIMM3
Bank Connections: 4 5
Current Speed: Unknown
Type: DIMM SDRAM
Installed Size: 4096 MB (Double-bank Connection)
Enabled Size: 4096 MB (Double-bank Connection)
Error Status: OK

Handle 0x000C, DMI type 6, 12 bytes
Memory Module Information
Socket Designation: DIMM4
Bank Connections: 6 7
Current Speed: Unknown
Type: DIMM SDRAM
Installed Size: Not Installed
Enabled Size: Not Installed
Error Status: OK

Handle 0x002E, DMI type 16, 15 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: None
Maximum Capacity: 8 GB
Error Information Handle: Not Provided
Number Of Devices: 4

Handle 0x0030, DMI type 17, 28 bytes
Memory Device
Array Handle: 0x002E
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 4096 MB
Form Factor: DIMM
Set: None
Locator: DIMM1
Bank Locator: BANK0
Type: SDRAM
Type Detail: Synchronous
Speed: 1333 MHz
Manufacturer: Manufacturer00
Serial Number: SerNum00
Asset Tag: AssetTagNum0
Part Number: ModulePartNumber00
Rank: Unknown

Handle 0x0032, DMI type 17, 28 bytes
Memory Device
Array Handle: 0x002E
Error Information Handle: Not Provided
Total Width: Unknown
Data Width: Unknown
Size: No Module Installed
Form Factor: DIMM
Set: None
Locator: DIMM2
Bank Locator: BANK1
Type: Unknown
Type Detail: Unknown
Speed: Unknown
Manufacturer: Manufacturer01
Serial Number: SerNum01
Asset Tag: AssetTagNum1
Part Number: ModulePartNumber01
Rank: Unknown

Handle 0x0034, DMI type 17, 28 bytes
Memory Device
Array Handle: 0x002E
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 4096 MB
Form Factor: DIMM
Set: None
Locator: DIMM3
Bank Locator: BANK2
Type: SDRAM
Type Detail: Synchronous
Speed: 1333 MHz
Manufacturer: Manufacturer02
Serial Number: SerNum02
Asset Tag: AssetTagNum2
Part Number: ModulePartNumber02
Rank: Unknown

Handle 0x0036, DMI type 17, 28 bytes
Memory Device
Array Handle: 0x002E
Error Information Handle: Not Provided
Total Width: Unknown
Data Width: Unknown
Size: No Module Installed
Form Factor: DIMM
Set: None
Locator: DIMM4
Bank Locator: BANK3
Type: Unknown
Type Detail: Unknown
Speed: Unknown
Manufacturer: Manufacturer03
Serial Number: SerNum03
Asset Tag: AssetTagNum3
Part Number: ModulePartNumber03
Rank: Unknown

schiztech here is the report
nikos@nikos-MS-7588:~$ lshw
WARNING: you should run this program as super-user.
nikos-ms-7588
description: Computer
width: 64 bits
capabilities: vsyscall32
*-core
description: Motherboard
physical id: 0
*-memory
description: System memory
physical id: 0
size: 3945MiB
*-cpu
product: Intel(R) Core(TM) i5 CPU 750 @ 2.67GHz
vendor: Intel Corp.
physical id: 1
bus info: cpu@0
size: 2668MHz
capacity: 2668MHz
width: 64 bits
capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp x86-64 constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida dtherm tpr_shadow vnmi flexpriority ept vpid cpufreq
*-pci:0
description: Host bridge
product: Core Processor DMI
vendor: Intel Corporation
physical id: 100
bus info: pci@0000:00:00.0
version: 11
width: 32 bits
clock: 33MHz
*-pci:0
description: PCI bridge
product: Core Processor PCI Express Root Port 1
vendor: Intel Corporation
physical id: 3
bus info: pci@0000:00:03.0
version: 11
width: 32 bits
clock: 33MHz
capabilities: pci normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:16 ioport:b000(size=4096) memory:f8000000-fbcfffff ioport:d0000000(size=268435456)
*-display
description: VGA compatible controller
product: G92 [GeForce GTS 250]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:01:00.0
version: a2
width: 64 bits
clock: 33MHz
capabilities: vga_controller bus_master cap_list rom
configuration: driver=nouveau latency=0
resources: irq:16 memory:fa000000-faffffff memory:d0000000-dfffffff memory:f8000000-f9ffffff ioport:bc00(size=128) memory:fbce0000-fbcfffff
*-generic:0 UNCLAIMED
description: System peripheral
product: Core Processor System Management Registers
vendor: Intel Corporation
physical id: 8
bus info: pci@0000:00:08.0
version: 11
width: 32 bits
clock: 33MHz
capabilities: cap_list
configuration: latency=0
*-generic:1 UNCLAIMED
description: System peripheral
product: Core Processor Semaphore and Scratchpad Registers
vendor: Intel Corporation
physical id: 8.1
bus info: pci@0000:00:08.1
version: 11
width: 32 bits
clock: 33MHz
capabilities: cap_list
configuration: latency=0
*-generic:2 UNCLAIMED
description: System peripheral
product: Core Processor System Control and Status Registers
vendor: Intel Corporation
physical id: 8.2
bus info: pci@0000:00:08.2
version: 11
width: 32 bits
clock: 33MHz
capabilities: cap_list
configuration: latency=0
*-generic:3 UNCLAIMED
description: System peripheral
product: Core Processor Miscellaneous Registers
vendor: Intel Corporation
physical id: 8.3
bus info: pci@0000:00:08.3
version: 11
width: 32 bits
clock: 33MHz
configuration: latency=0
*-generic:4 UNCLAIMED
description: System peripheral
product: Core Processor QPI Link
vendor: Intel Corporation
physical id: 10
bus info: pci@0000:00:10.0
version: 11
width: 32 bits
clock: 33MHz
configuration: latency=0
*-generic:5 UNCLAIMED
description: System peripheral
product: Core Processor QPI Routing and Protocol Registers
vendor: Intel Corporation
physical id: 10.1
bus info: pci@0000:00:10.1
version: 11
width: 32 bits
clock: 33MHz
configuration: latency=0
*-usb:0
description: USB controller
product: 5 Series/3400 Series Chipset USB2 Enhanced Host Controller
vendor: Intel Corporation
physical id: 1a
bus info: pci@0000:00:1a.0
version: 05
width: 32 bits
clock: 33MHz
capabilities: ehci bus_master cap_list
configuration: driver=ehci-pci latency=0
resources: irq:16 memory:f7ffc000-f7ffc3ff
*-multimedia
description: Audio device
product: 5 Series/3400 Series Chipset High Definition Audio
vendor: Intel Corporation
physical id: 1b
bus info: pci@0000:00:1b.0
version: 05
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list
configuration: driver=snd_hda_intel latency=0
resources: irq:46 memory:f7ff8000-f7ffbfff
*-pci:1
description: PCI bridge
product: 5 Series/3400 Series Chipset PCI Express Root Port 1
vendor: Intel Corporation
physical id: 1c
bus info: pci@0000:00:1c.0
version: 05
width: 32 bits
clock: 33MHz
capabilities: pci normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:17 ioport:1000(size=4096) memory:c0000000-c01fffff ioport:c0200000(size=2097152)
*-pci:2
description: PCI bridge
product: 5 Series/3400 Series Chipset PCI Express Root Port 6
vendor: Intel Corporation
physical id: 1c.5
bus info: pci@0000:00:1c.5
version: 05
width: 32 bits
clock: 33MHz
capabilities: pci normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:16 ioport:c000(size=4096) memory:fbd00000-fbdfffff ioport:f6f00000(size=1048576)
*-network
description: Ethernet interface
product: RTL8111/8168 PCI Express Gigabit Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:03:00.0
logical name: eth0
version: 03
serial: 40:61:86:34:7e:c5
size: 100Mbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl_nic/rtl8168d-1.fw ip=192.168.10.9 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
resources: irq:45 ioport:c800(size=256) memory:fbdff000-fbdfffff memory:f6ffc000-f6ffffff memory:fbdc0000-fbddffff
*-pci:3
description: PCI bridge
product: 5 Series/3400 Series Chipset PCI Express Root Port 7
vendor: Intel Corporation
physical id: 1c.6
bus info: pci@0000:00:1c.6
version: 05
width: 32 bits
clock: 33MHz
capabilities: pci normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:18 ioport:d000(size=4096) memory:fbe00000-fbefffff ioport:c0400000(size=2097152)
*-firewire
description: FireWire (IEEE 1394)
product: VT6315 Series Firewire Controller
vendor: VIA Technologies, Inc.
physical id: 0
bus info: pci@0000:04:00.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: ohci bus_master cap_list
configuration: driver=firewire_ohci latency=0
resources: irq:18 memory:fbeff800-fbefffff ioport:d800(size=256)
*-pci:4
description: PCI bridge
product: 5 Series/3400 Series Chipset PCI Express Root Port 8
vendor: Intel Corporation
physical id: 1c.7
bus info: pci@0000:00:1c.7
version: 05
width: 32 bits
clock: 33MHz
capabilities: pci normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:19 ioport:e000(size=4096) memory:fbf00000-fbffffff ioport:c0600000(size=2097152)
*-storage
description: SATA controller
product: JMB363 SATA/IDE Controller
vendor: JMicron Technology Corp.
physical id: 0
bus info: pci@0000:05:00.0
version: 03
width: 32 bits
clock: 33MHz
capabilities: storage ahci_1.0 bus_master cap_list
configuration: driver=ahci latency=0
resources: irq:19 memory:fbffe000-fbffffff
*-ide
description: IDE interface
product: JMB363 SATA/IDE Controller
vendor: JMicron Technology Corp.
physical id: 0.1
bus info: pci@0000:05:00.1
version: 03
width: 32 bits
clock: 33MHz
capabilities: ide bus_master cap_list
configuration: driver=pata_jmicron latency=0
resources: irq:16 ioport:ec00(size=8) ioport:e880(size=4) ioport:e800(size=8) ioport:e480(size=4) ioport:e400(size=16)
*-usb:1
description: USB controller
product: 5 Series/3400 Series Chipset USB2 Enhanced Host Controller
vendor: Intel Corporation
physical id: 1d
bus info: pci@0000:00:1d.0
version: 05
width: 32 bits
clock: 33MHz
capabilities: ehci bus_master cap_list
configuration: driver=ehci-pci latency=0
resources: irq:23 memory:f7ff6000-f7ff63ff
*-pci:5
description: PCI bridge
product: 82801 PCI Bridge
vendor: Intel Corporation
physical id: 1e
bus info: pci@0000:00:1e.0
version: a5
width: 32 bits
clock: 33MHz
capabilities: pci subtractive_decode bus_master cap_list
*-isa
description: ISA bridge
product: 5 Series Chipset LPC Interface Controller
vendor: Intel Corporation
physical id: 1f
bus info: pci@0000:00:1f.0
version: 05
width: 32 bits
clock: 33MHz
capabilities: isa bus_master cap_list
configuration: driver=lpc_ich latency=0
resources: irq:0
*-ide:0
description: IDE interface
product: 5 Series/3400 Series Chipset 4 port SATA IDE Controller
vendor: Intel Corporation
physical id: 1f.2
bus info: pci@0000:00:1f.2
version: 05
width: 32 bits
clock: 66MHz
capabilities: ide bus_master cap_list
configuration: driver=ata_piix latency=0
resources: irq:19 ioport:ac00(size=8) ioport:a880(size=4) ioport:a800(size=8) ioport:a480(size=4) ioport:a400(size=16) ioport:a080(size=16)
*-serial UNCLAIMED
description: SMBus
product: 5 Series/3400 Series Chipset SMBus Controller
vendor: Intel Corporation
physical id: 1f.3
bus info: pci@0000:00:1f.3
version: 05
width: 64 bits
clock: 33MHz
configuration: latency=0
resources: memory:f7ff4000-f7ff40ff ioport:400(size=32)
*-ide:1
description: IDE interface
product: 5 Series/3400 Series Chipset 2 port SATA IDE Controller
vendor: Intel Corporation
physical id: 1f.5
bus info: pci@0000:00:1f.5
version: 05
width: 32 bits
clock: 66MHz
capabilities: ide bus_master cap_list
configuration: driver=ata_piix latency=0
resources: irq:19 ioport:9c00(size=8) ioport:9880(size=4) ioport:9800(size=8) ioport:9480(size=4) ioport:9400(size=16) ioport:9080(size=16)
*-pci:1
description: Host bridge
product: Core Processor QuickPath Architecture Generic Non-Core Registers
vendor: Intel Corporation
physical id: 101
bus info: pci@0000:ff:00.0
version: 04
width: 32 bits
clock: 33MHz
*-pci:2
description: Host bridge
product: Core Processor QuickPath Architecture System Address Decoder
vendor: Intel Corporation
physical id: 102
bus info: pci@0000:ff:00.1
version: 04
width: 32 bits
clock: 33MHz
*-pci:3
description: Host bridge
product: Core Processor QPI Link 0
vendor: Intel Corporation
physical id: 103
bus info: pci@0000:ff:02.0
version: 04
width: 32 bits
clock: 33MHz
configuration: driver=i7core_edac
resources: irq:0
*-pci:4
description: Host bridge
product: Core Processor QPI Physical 0
vendor: Intel Corporation
physical id: 104
bus info: pci@0000:ff:02.1
version: 04
width: 32 bits
clock: 33MHz
*-pci:5
description: Host bridge
product: Core Processor Integrated Memory Controller
vendor: Intel Corporation
physical id: 105
bus info: pci@0000:ff:03.0
version: 04
width: 32 bits
clock: 33MHz
*-pci:6
description: Host bridge
product: Core Processor Integrated Memory Controller Target Address Decoder
vendor: Intel Corporation
physical id: 106
bus info: pci@0000:ff:03.1
version: 04
width: 32 bits
clock: 33MHz
*-pci:7
description: Host bridge
product: Core Processor Integrated Memory Controller Test Registers
vendor: Intel Corporation
physical id: 107
bus info: pci@0000:ff:03.4
version: 04
width: 32 bits
clock: 33MHz
*-pci:8
description: Host bridge
product: Core Processor Integrated Memory Controller Channel 0 Control Registers
vendor: Intel Corporation
physical id: 108
bus info: pci@0000:ff:04.0
version: 04
width: 32 bits
clock: 33MHz
*-pci:9
description: Host bridge
product: Core Processor Integrated Memory Controller Channel 0 Address Registers
vendor: Intel Corporation
physical id: 109
bus info: pci@0000:ff:04.1
version: 04
width: 32 bits
clock: 33MHz
*-pci:10
description: Host bridge
product: Core Processor Integrated Memory Controller Channel 0 Rank Registers
vendor: Intel Corporation
physical id: 10a
bus info: pci@0000:ff:04.2
version: 04
width: 32 bits
clock: 33MHz
*-pci:11
description: Host bridge
product: Core Processor Integrated Memory Controller Channel 0 Thermal Control Registers
vendor: Intel Corporation
physical id: 10b
bus info: pci@0000:ff:04.3
version: 04
width: 32 bits
clock: 33MHz
*-pci:12
description: Host bridge
product: Core Processor Integrated Memory Controller Channel 1 Control Registers
vendor: Intel Corporation
physical id: 10c
bus info: pci@0000:ff:05.0
version: 04
width: 32 bits
clock: 33MHz
*-pci:13
description: Host bridge
product: Core Processor Integrated Memory Controller Channel 1 Address Registers
vendor: Intel Corporation
physical id: 10d
bus info: pci@0000:ff:05.1
version: 04
width: 32 bits
clock: 33MHz
*-pci:14
description: Host bridge
product: Core Processor Integrated Memory Controller Channel 1 Rank Registers
vendor: Intel Corporation
physical id: 10e
bus info: pci@0000:ff:05.2
version: 04
width: 32 bits
clock: 33MHz
*-pci:15
description: Host bridge
product: Core Processor Integrated Memory Controller Channel 1 Thermal Control Registers
vendor: Intel Corporation
physical id: 10f
bus info: pci@0000:ff:05.3
version: 04
width: 32 bits
clock: 33MHz
*-scsi
physical id: 2
logical name: scsi1
capabilities: emulated
*-cdrom
description: DVD-RAM writer
product: DVD RW AD-7240S
vendor: Optiarc
physical id: 0.0.0
bus info: scsi@1:0.0.0
logical name: /dev/cdrom
logical name: /dev/cdrw
logical name: /dev/dvd
logical name: /dev/dvdrw
logical name: /dev/sr0
version: 1.02
capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram
configuration: ansiversion=5 status=nodisc
*-scsi:0
physical id: 1
bus info: scsi@8
logical name: scsi8
capabilities: scsi-host
configuration: driver=usb-storage
*-scsi:1
physical id: 2
bus info: scsi@9
logical name: scsi9
capabilities: scsi-host
configuration: driver=usb-storage
WARNING: output may be incomplete or inaccurate, you should run this program as super-user.

nikos@nikos-MS-7588:~$ free -m
total used free shared buffers cached
Mem: 3945 3803 141 0 65 2395
-/+ buffers/cache: 1342 2602
Swap: 4085 0 4085

here is the link too if it helps http://pastebin.com/05BWn3A0

Will doand reply again. Thanks for your help.