New Computer Problems.. (ATI?)

[Farske]

Hail

First off Ill put my computer specs, and what I have done...

CPU Barton 2.6ghz
512MB Ram
ATI Radeon 9600 Pro 256
KS78XE Asrock Mobo (SIS Chipset)
Link to more indepth info... http://www.asrock.com/product/product_k7s8xe+.htm
2 HardDrives:
C- 60gb (windows, program files, installed games)
D- 80gb (Storage: music, films, backuped games)
I have a Case Fan aswell as a cpu fan, and the system stays around 40-45C
My sound card is Mobo based, a SIS 7012 Audio Device
Standard 56k Modem
Lan Card 10/100
Windows XP Pro SP1

Thats about it.

Problem:
SOME games will either restart randomly.... the whole system restarts...
Some games include: Battlefield 1942, Laser Squad Nemsis (In the middle of a massive HotSeat Game.. ughh!! lol) and thats about it, I havent bothered to install any other games yet...

Battlefield will restart only when its loading a map..
Laser squad restarted when processing turns.

What I have done:
Installed Service Pack 1 (SP1)
Installed ATI Catalyst 3.8 (Then installed 4.1 currenly at 4.1)
Installed DirectX 9.0b
Fitted a case fan.

Went back to the shop and exchanged my memory stick for a new one.... Problem NOW doesnt happen as quickly, sometimes I can play games, sometimes it crashes (in relation to Battlefield Loading)

My ATI Radeon 9600 Pro 256mb should be able to use 8x AGP..
My motherboard has enabled Fast Write and 8x AGP
When I check Catalyst, I choose 8x AGP with the slider and it says "restart" computer restarts (sits on blue screen for AGES after restart... eventually goes) then when it loads up, its back to Off..

Okay thats about it... Any ideas anyone!?
*sighs* I Think its the motherboard...

I Dont know if been stuck for 5 days now, please anyone!?
Thanks for your time

Distressed Farske

[Peeping Tom]

What power supply do you have? When a vido ard begins rendering a game, it takes a LOT more power. You'll prolly need a new PSU.

[[+Glasius+]]

If you want to monitor your watt usage, there are different freewares all over the net. If your mobo manufactorer has a program on their sites, it will probably be the most accurate.
If your worried about weither or not to get a new PSU, do some good old math and see if you got enought juice from your current PSU.

AMD Athlon XP - 60W-72W
AMD Athlon XP Tbred - 50W-75W
AMD Duron 1.0-1.3Ghz - 50W-55W
Intel P3 800-1.4Ghz - 25W-40W
Intel P4 1.4-20Ghz - 55W-75W
Intel P4 Northwood - 55W-70W
Intel P4 3.06Ghz+ - 75W
Intel Celeron FC-PGA/FC-PGA2 - 25W-35W
Intel Celeron Skt. 478 - 45W-55W
ATX Motherboard - 40W-65W
AGP Video Card - 30W-70W
PCI Video Card - 20W-35W
256MB RAM - 20W
512MB RAM - 35W
IDE CD-RW Drive - 25W-35W
SCSI CD-RW Drive - 20W-25W
IDE CD-Rom - 20W-30W
SCSI CD-Rom - 15W-20W
IDE DVD-Rom - 20W-25W
IDE Hard Drive - 15W-20W
SCSI Hard Drive - 15W-25W
15,000 RPM SCSI Hard Drive - 35W
Floppy Drive - 8W
Network Card - 5W
Modem - 5W
Sound Card - 5W-10W
SCSI Controller Card - 20W
FireWire Controller Card - 30W-40W
USB 2.0 Controller Card - 5W-20W
Case Fan - 3W
CPU Fan - 3W