Upgraded My Computer to make it shut down

I've recently upgraded my computer.I added in a 2GB RAM,change my graphic card from ATI Radeon X600 to Nvidia Geforcec 9800 GT and change my PSU to 500 WATTS.

But everytime i play games like team fortress 2 or counter strike source after i play maybe for like 20mins the monitor will change from green to orange(off) keyboard not lighted up and mouse will be off too.Its fine if i play warcraft 3.

AND ANOTHER THING the CPU light is on.Im using a dell dimension 9150 could someone help please here are my specifications

Computer
Computer Type ACPI Multiprocessor PC
Operating System Microsoft Windows XP Professional
OS Service Pack [ TRIAL VERSION ]
Internet Explorer 6.0.2900.5512
DirectX 4.09.00.0904 (DirectX 9.0c)
Computer Name BJORN-0DDE26EED
User Name Administrator
Logon Domain [ TRIAL VERSION ]
Date / Time 2008-10-13 / 15:46

Motherboard
CPU Type DualCore Intel Pentium D 940, 3200 MHz (16 x 200)
Motherboard Name Dell XPS 400 / Dimension 9150 (3 PCI, 1 PCI-E x1, 1 PCI-E x4, 1 PCI-E x16, 4 DDR2 DIMM, Audio, Gigabit LAN)
Motherboard Chipset Intel Lakeport i945P
System Memory [ TRIAL VERSION ]
BIOS Type Phoenix (01/08/07)

Display
Video Adapter NVIDIA GeForce 9800 GT (512 MB)
3D Accelerator nVIDIA GeForce 9800 GT
Monitor Dell E196FP [19" LCD] (HC51666C4D0S)

Multimedia
Audio Adapter SigmaTel STAC9220 A1 @ Intel 82801GB ICH7 - High Definition Audio Controller [A-1]

Storage
IDE Controller Intel(R) 82801G (ICH7 Family) Ultra ATA Storage Controllers - 27DF
IDE Controller Intel(R) 82801GR/GH SATA AHCI Controller
Disk Drive WDC WD1600JS-75NCB1 (149 GB, IDE)
Optical Drive HL-DT-ST DVD+-RW GWA4164B (DVD+R9:6x, DVD-R9:4x, DVD+RW:16x/8x, DVD-RW:16x/6x, DVD-ROM:16x, CD:40x/32x/40x DVD+RW/DVD-RW)
SMART Hard Disks Status FAIL

Partitions
C: (NTFS) [ TRIAL VERSION ]
Total Size [ TRIAL VERSION ]

Input
Keyboard HID Keyboard Device
Mouse HID-compliant mouse

Network
Primary IP Address [ TRIAL VERSION ]
Primary MAC Address 00-13-72-13-39-E4
Network Adapter Intel(R) PRO/1000 PL Network Connection (192. [ TRIAL VERSION ])

Peripherals
Printer Microsoft XPS Document Writer
USB1 Controller Intel 82801GB ICH7 - USB Universal Host Controller [A-1]
USB1 Controller Intel 82801GB ICH7 - USB Universal Host Controller [A-1]
USB1 Controller Intel 82801GB ICH7 - USB Universal Host Controller [A-1]
USB1 Controller Intel 82801GB ICH7 - USB Universal Host Controller [A-1]
USB2 Controller Intel 82801GB ICH7 - Enhanced USB2 Controller [A-1]
USB Device Razer Diamondback
USB Device USB Human Interface Device

DMI
DMI BIOS Vendor Dell Inc.
DMI BIOS Version A07
DMI System Manufacturer Dell Inc.
DMI System Product Dell DXP051
DMI System Version
DMI System Serial Number [ TRIAL VERSION ]
DMI System UUID [ TRIAL VERSION ]
DMI Motherboard Manufacturer Dell Inc.
DMI Motherboard Product 0FJ030
DMI Motherboard Version
DMI Motherboard Serial Number [ TRIAL VERSION ]
DMI Chassis Manufacturer Dell Inc.
DMI Chassis Version
DMI Chassis Serial Number [ TRIAL VERSION ]
DMI Chassis Asset Tag [ TRIAL VERSION ]
DMI Chassis Type Tower

North Bridge Properties
North Bridge Intel Lakeport i945P
Intel Platform Anchor Creek
Supported FSB Speeds FSB533, FSB800, FSB1066
Supported Memory Types DDR2-400 SDRAM, DDR2-533 SDRAM, DDR2-667 SDRAM
Maximum Memory Amount 4 GB
Revision 00
Package Type 1202 Pin FC-BGA
Package Size 3.4 cm x 3.4 cm
Core Voltage 1.5 V
In-Order Queue Depth 12

Memory Controller
Type Dual Channel (128-bit)
Active Mode Dual Channel (128-bit)

Memory Timings
CAS Latency (CL) 4T
RAS To CAS Delay (tRCD) 4T
RAS Precharge (tRP) 4T
RAS Active Time (tRAS) 12T
Row Refresh Cycle Time (tRFC) 34T
Write To Precharge Delay (tWTP) 11T
Refresh Period (tREF) 7.8 us

Error Correction
ECC Not Supported
ChipKill ECC Not Supported
RAID Not Supported
ECC Scrubbing Not Supported

Memory Slots
DRAM Slot #1 512 MB (DDR2 SDRAM)
DRAM Slot #2 2 GB (DDR2 SDRAM)
DRAM Slot #3 512 MB (DDR2 SDRAM)

PCI Express Controller
PCI-E 1.0 x16 port #2 In Use @ x16 (nVIDIA GeForce 9800 GT Video Adapter)

Chipset Manufacturer
Company Name Intel Corporation
Product Information http://www.intel.com/products/chipsets
Driver Download http://support.intel.com/support/chipsets
Driver Update http://driveragent.com?ref=59
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More about upgraded computer make shut down
  1. Have you considered that the PCI-E 1.0 x 16 port may be bottle necking the GPU. I was thinking of getting the 9800 gts and installing it in my system with a PCI-E x 16 slot but, I am hesitant because it may not be worth installing because of what I just mentioned. That may or may not be the problem, if you figure your problem out, I would like to know as well.
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