Asus p8z77-v pro/thunderbolt cpu red light solid, no post

OK, putting a new system together. Got all the parts together and there's a solid red cpu light
on the mother board. The system powers good, but will not post. Looking for better ideas.
Sorry about the length here, but I know sometimes the trick is in the details. If there's something
stupid I'm missing please help.

I've read several posts to see if If I could resolve the issue before posting anywhere.
Here is what i've done already.

1. I took out CPU checked for bent pins and reinstalled. All was normal, no change.
2. I have 4 sticks of RAM so I removed first 2 then 3. Manual calls for single stick in
slot 2, 2 sticks in slots 2 and 4. I have tried switching to 1,3 and 1 still no change.
3. I removed 1 at a time all drives attatched to the MB. With all 4 drives unconnected
still no change.
4. I removed and reseated GPU no change.
5. I removed and reseated all PSU power cables to all drives, boards, fans, and case.
6. I've reset cleared rtc via the 3 pin connector
7. I've tried the bios flashback button I've not manually updated bios via usb (still an option)

Parts :


TypeATX 12V v2.2 / EPS 12V v2.91
Maximum Power850W
Fans140 mm blue & white switch LED fan
Main Connector20+4Pin
+12V Rails6
PCI-Express Connector2 x 6-Pin, 2 x 6+2-Pin
SATA Power Connector8
EfficiencyMore than 87 %
Energy-Efficient80 PLUS BRONZE Certified
Over Voltage ProtectionYes
Input Voltage115 / 230 V
Input Frequency Range50/60 Hz
MTBF>100,000 Hours

CPU Socket TypeLGA 1155
CPU TypeCore i7 / i5 / i3 (LGA1155)
Supported CPU TechnologiesTurbo Boost Technology 2.0Chipsets
North BridgeIntel Z77Memory
Number of Memory Slots4×240pin
Memory StandardDDR3 2600(O.C.)/2400(O.C.)/2200(O.C.)/2133(O.C.)/2000(O.C.)/1866(O.C.)/1800(O.C.)/1600/1333
Maximum Memory Supported32GB
Channel SupportedDual ChannelExpansion Slots
PCI Express 3.0 x162 (x16/0 or x8/x8)
PCI Express 2.0 x161 @x4
PCI Express x12
PCI Slots2Storage Devices
SATA 3Gb/s4
SATA 6Gb/s4 x SATA 6Gb/s
SATA RAID2 x SATA 6Gb/s (gray) 4 x SATA 3Gb/s (blue) Support RAID 0, 1, 5, 10Onboard Video
Onboard Video ChipsetNoneOnboard Audio
Audio ChipsetRealtek ALC892
Audio Channels8 ChannelsOnboard LAN
LAN ChipsetIntel 82579V
Max LAN Speed10/100/1000Mbps
Wireless LANWiFi IEEE 802.11b/g/nRear Panel Ports
PS/21 x PS/2 keyboard/mouse port
Video PortsD-Sub + DVI
USB 3.04 x USB 3.0
S/PDIF Out1 x Optical
Audio Ports6 PortsInternal I/O Connectors
Onboard USB2 x USB 3.0 + 10 x USB 2.0
Other Connectors1 x TPM connector(s)
1 x COM port(s) connector(s)
1 x CPU Fan connector(s) (4 -pin)
1 x CPU OPT Fan connector(s) (4 -pin)
3 x Chassis Fan connector(s) (4 -pin)
1 x S/PDIF out header(s)
1 x 24-pin EATX Power connector(s)
1 x 8-pin ATX 12V Power connector(s)
1 x Front panel audio connector(s) (AAFP)
1 x System panel(s) (Q-Connector)
1 x MemOK! button(s)
1 x TPU switch(es)
1 x EPU switch(es)
1 x CPU/DRAM overvoltage jumper(s)
1 x Clear CMOS jumper(s)
1 x USB BIOS Flashback button(s)Physical Spec
Form FactorATX
Dimensions12.0" x 9.6"
Power Pin24 PinFeatures
FeaturesDual Intelligent Processors 3 with SMART DIGI+ Power Control

SMART DIGI+ - Get a Blazing Performance Boost and CPU Wattage Requirements Cut in Half!

Thunderbolt onboard - Blistering-fast Data Transfer and Daisy Chain Expansion

Wi-Fi GO! - DLNA Streaming and Remote Desktop Made Easy

Fan Xpert 2 - The Most Customizable Fan Controls\

USB 3.0 Boost - Faster USB 3.0 Transmission with UASP(170%)

SeriesCore i7
ModelBX80637I73770KCPU Socket Type
CPU Socket TypeLGA 1155Tech Spec
CoreIvy Bridge
NameCore i7-3770K
Operating Frequency3.5GHz (3.9GHz Turbo)
L2 Cache4 x 256KB
L3 Cache8MB
Manufacturing Tech22 nm
64 bit SupportYes
Hyper-Threading SupportYes
Integrated Memory Controller SpeedDual-channel DDR3 Memory Controller supports DDR3-1333 and DDR3-1600 memory
Virtualization Technology SupportYes
Integrated GraphicsIntel HD Graphics 4000
Graphics Base Frequency650MHz
Graphics Max Dynamic Frequency1.15GHz
Thermal Design Power77W
Cooling DeviceHeatsink and Fan included

InterfacePCI Express 3.0 x16Chipset
Chipset ManufacturerNVIDIA
GPUGeForce GTX 680
Core Clock1058MHz
Boost Clock1124MHz
CUDA Cores1536Memory
Effective Memory Clock6208MHz
Memory Size2GB
Memory Interface256-bit
Memory TypeGDDR53D API
DirectXDirectX 11
OpenGLOpenGL 4.2Ports
DisplayPort1 x DisplayPort
DVI2 x DVIGeneral
Max Resolution2560 x 1600 (DL-DVI)
3D VISION Game ReadyYes
SLI SupportSLI Ready
CoolerWith Fan
System RequirementsMinimum of a 550 Watt power supply.
Power Connector2 x 6 Pin
Dual-Link DVI SupportedYes
HDCP ReadyYes
Card Dimensions10" x 4.38"

Memory :
Type240-Pin DDR3 SDRAMTech Spec
Capacity32GB (4 x 8GB)
SpeedDDR3 1600
Cas Latency9
Multi-channel KitDual Channel Kit
Heat SpreaderYes
Features32GB (4x8GB) DDR3 for Intel quad channel platforms.

1600MHz with headroom to allow overclocking

9-9-9-24 latency

Vengeance heat spreader for styling and performance

Intel XMP 1.3 (Extreme Memory Profile) Support

Also compatible with Intel and AMD dual channel DDR3 Platforms
1 answer Last reply
More about asus p8z77 thunderbolt light solid post
  1. I have the same board and I got mines to work by placing my ram in slots 2, 4.
    I also have 32 gb of ram.
    I had to turn off the two toggle switches on the mobo for tpu and epu.
    That did it for me.
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