Problems with Ati 9550 and Compaq

[jeepnut24]

Ok kinda a newb question, but we are having serious issues and don't know where to turn.

Ati 9550 256Mb AGP
Presario SR1030NX
2.16 GHz Athlon XP 3000+
512 MB RAM
Windows XP Home Edition

400Watt power supply

We have unistalled the onboard video drivers. The Bios has a PCI option and an AGP/On Board option. We selected the AGP/On Board. Plugged the 9550 in and tried to install the drivers and catalyst. We have also upgraded the power supply to an Antec 400Watt unit. We upgraded the bios to the latest version. Windows will boot, and we can play about 5 minutes of a game and then the screen shuts off. Not the PC, just the screen. Any help would be greatly appreicated. We don't know where to turn from here. The board says it supports 4x/8x agp??

Thanks a million

 

[deepred98]

why do you keep saying "we"

i have a similar computer and i'm running my 6600GT just fine
could be driver issues with ATI
i don't think you actually need to upgrade the PSU (i'm running a 300W)
and if all else fails just call compaq
and you shouldn't need to screw around with the BIOS