Were these new parts? It seems like an oddity that the HD and video card would die together.
Have you checked what voltages your PSU is putting out just to be sure you aren't frying things?
Fusion Brain Version 6 Released!
1.9in x 2.9in -- 47mm x 73mm
30 Digital Outputs -- Directly drive a relay
15 Analogue Inputs -- Read sensors like temperature, light, distance, acceleration, and more
Buy now in the MP3Car.com Store