Re: Computer won't boot up with GTX 280
I'd recommend trying to boot up with the 280 plugged in but unplug 3 of the 4 hard drives and anything else you can spare. If it boots up with all nonessential peripherals then you have a pretty good idea that your PSU just isn't up to the task.
C2Q @ 3.6GHz | GA-P35-DS3L | 8GB DDR2 | EVGA GTX 580 SC 1.5GB | Windows 7 Ultimate x64
C2D @ 3.0GHz | GA-P35-DS3L | 4GB DDR2 | HIS AMD 6990 4GB | OS X Lion 10.7 | Windows 7 Ultimate x64