obviously the 650w PSU didn't have enough juice on the rails the GPU Needed.
I gotta agree with this genius. Todays new cards are power hungry hogs and are more powerful than many of our first computers so you gotta feed them what they need or else your gonna be chasing gremlins trying to figure out problems.
Take your current supply back and get 1000 watts at least to help future proof your system.
Good Luck
Mr Wags
