Re: Graphics card problems..
Try reseating it again, make sure the power supply cables are plugged in correctly. Whilst the PC is not plugged into the wall outlet, click the power button a few times (yes, this does sometimes fix it). If this doesn't work then I'd guess that either:
A) The card itself is defective.
B) The power supply is no longer providing enough power to support the card.
Athlon II x4 645 || 1TB 7200rpm HDD || EVGA GTX 650Ti OC || 8GB DDR3 RAM || Windows 7 Home x64
i5 4210M || 500GB Samsung EVO 850 SSD || GeForce 825M || 16GB DDR3 RAM || Windows 10 x64