My Problem: Computer occasionally turns self off in games (such as warcraft 3, neverwinter nights) We think it is something to do with too much power usage by the graphics card in rendering, we suspect the graphics card because the computer never turns it off normally, it only happens (that i have tried) in games.

My Specs (direct from dx diag):

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System Information
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Operating System: Windows XP Home Edition (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_rtm.040803-2158)
Language: English (Regional Setting: English)
System Manufacturer: VIA
System Model: P4VX4
BIOS: Default System BIOS
Processor: Intel(R) Pentium(R) 4 CPU 2.66GHz
Memory: 1536MB RAM
Page File: 210MB used, 3224MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
DxDiag Version: 5.03.2600.2180 32bit Unicode

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DxDiag Notes
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DirectX Files Tab: No problems found.
Display Tab 1: No problems found.
Sound Tab 1: No problems found.
Music Tab: No problems found.
Input Tab: No problems found.
Network Tab: No problems found.

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DirectX Debug Levels
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Direct3D: 0/4 (n/a)
DirectDraw: 0/4 (retail)
DirectInput: 0/5 (n/a)
DirectMusic: 0/5 (n/a)
DirectPlay: 0/9 (retail)
DirectSound: 0/5 (retail)
DirectShow: 0/6 (retail)

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Display Devices
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Card name: NVIDIA GeForce FX 5200
Manufacturer: NVIDIA
Chip type: GeForce FX 5200
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_0322&SUBSYS_00000000&REV_A1
Display Memory: 128.0 MB
Current Mode: 1024 x 768 (32 bit) (60Hz)
Monitor: Default Monitor
Monitor Max Res:
Driver Name: nv4_disp.dll
Driver Version: 6.14.0010.6693 (English)
DDI Version: 9 (or higher)
Driver Attributes: Final Retail
Driver Date/Size: 10/29/2004 16:50:00, 3736704 bytes
WHQL Logo'd: Yes
WHQL Date Stamp: n/a
VDD: n/a
Mini VDD: nv4_mini.sys
Mini VDD Date: 10/29/2004 16:50:00, 2826944 bytes
Device Identifier: {D7B71E3E-4062-11CF-9579-0A2000C2CB35}
Vendor ID: 0x10DE
Device ID: 0x0322
SubSys ID: 0x00000000
Revision ID: 0x00A1
Revision ID: 0x00A1
Video Accel: ModeMPEG2_A ModeMPEG2_B ModeMPEG2_C ModeMPEG2_D

Registry: OK
DDraw Status: Enabled
D3D Status: Enabled
AGP Status: Enabled
DDraw Test Result: Not run
D3D7 Test Result: Not run
D3D8 Test Result: Not run
D3D9 Test Result: Not run

You dont need sound specs i dont think. Plz help me we've had this problem for ages