He said that his PSU was just 300W so could it be a PSU issue??
it could be...
Was it working on his computer before?
Have him try pressing F8 before windows loads but then, instead of choosing safe mode choose "VGA mode".
Then uninstall any and ALL video card drivers.
Reboot the computer.
Installed the latest video card drivers from ATI.
It was working fine on my computer!!! and he said he didn't see VGA mode but low resolution mode. is it same? and when he tried to install the driver he got a message stating no detective drivers found.