|I would say that it's not a bad processor. If your CPU had "gone bad" your system probably wouldn't work at all.|
Did this problem start happening after you bought the new video card, or did you buy the new video card to see if it solved the problem?
If it started happening after you bought the new card, I would make sure it's connected all correctly, including the 12v cables. The new video cards need a lot of power.
700w should be enough, but sometimes that depends on what else you have in your system.
Also, make sure your video card is plugged into the appropriate slot on your Motherboard. Some motherboards have a primary and secondary slot.