Instability Problems

[ManiaC]

Ok, so i installed my Voodoo 5 5500 PCI along side my Geforce FX 5950Ultra, it ran fine for a few hours and then the fans on the FX59050U cut out and i was force to reboot. checking the power connectors to both cards i rebooted and everything was fine. Today however i was playing CSS with the FX5950U and all of a sudden the screen went to stand by and the system stopped responding. I reset the PC and the US keyboard and mouse refused to work. Everything works fine now that i have removed the Voodoo.

So any ideas what the problem is?

My PSU is a 550W and mobo = Asus A7N8X Deluxe.

[ps47]

I have fixed my system stability issues by booting from pci vga (in the BIOS).just a suggestion,not sure if it helps (I was locking up within few minutes)..