Hello,
I encounter very strange prb with my video card Sparkle 6600GT AGP.
When I don't plug the 4-pin supply cable of the card, all is all-right execpt the driver detects the lack of power and switch on low-quality mode which is very very slowly when gaming. But anyway I can boot, I can start Window XP Pro, and I can work.
When I plug the 4-pin cable, problems arise: I have to restart several times before having the BIOS POST screen !!! And several times to have Windows starting but freezing during start. And when I could log on Windows at last, it sometimes freeze even when just scrolling on Internet Explorer...
Any idea ? I have an 540W Antec power supply, 2 Xeons 3.06Ghz on ASUS PC-DL bi-dual motheroard, 3 hard disks and a combo...But imo 540W should be enought.
The prb seems to be hardware.