Hello everyone,
As some of you may know, I recently upgraded to an Nvidia GTX 550 card and swapped out my power supply for a 400W rather than a 250W.
The main problem I'm having is that every game program immediately exits out after starting or will just show up black when a menu should appear.
I am running on a Windows 7 64-bit computer with an AMD Athlon II X4 635 Processor (2.90 GHz) with 4.00 GB of RAM.
Any technical help would be appreciated.
EDIT: The only game it has run so far was GTA SA, but that was after letting the computer sit and run for about 20 minutes..