Problems with computer build
 

Hello,

I currently have the following setup:

Thermaltake VA8000BWS Case
Thermaltake ToughPower 750W
ASUS P5N32-E SLI
Core 2 Duo E6600
OCZ OCZ2G8001GK
MSI Geforce 8800 GTS

I've recently built this thing, and for some reason I'm coming across the following problems:
- tool-free clips are no good, cannot hold the video card or the included sound card securely
- the ATX rear plate is 0.5 cm too short of the mounting holes for the actual video/sound card; forcing a mount will end up causing a short (e.g., cards at an angle)
- system likes to freeze up or not POST at all (tried updating BIOS for this too). It'll even freeze in BIOS.

Any suggestions? Thanks.