12GB RAM
GeForce GTS450
800w PSU
ASUS mobo of some kind
Win7 on SSD
2x SATA data drives
For some reason, the damn thing keeps locking up at random intervals. When I say lock, I mean that the desktop will freeze and the whole PC becomes unresponsive including the caps/num/scroll lock lights on the keyboard. Only a push of the reset button fixes it.
Sometimes it will be okay for a week. Other times it'll do it once a day. Sometimes it'll be three times a day. Sometimes it happens when the screen is locked and I'm not even using it (PC stays on 24/7).
Doesn't matter if it's hot/cold/low load internet or high load gaming.
Only thing I have noticed is that sometimes the gfx driver gets stuck and closes itself down, only to restart immediately but with slightly odd effects (some solid menu bars are now transparent, the cursor becomes a text line rather than an arrow). Related?
I've not done a damn thing to try and solve this yet

RAM stick dodgy?
GFX card on way out?
Heat?
SSD dying?
Any others? Where should I be looking first?