I just read a great article over at pcstats.com with some great tips on how to prevent a disaster from happening, One tip I a really liked was this one-
It's unknown how many fatalities LAN parties contribute to the global toll of computers, but it's got to be a large number. Moving your computer too often is a recipe for disaster. ... If you've just transported your system any distance, take the cover off and check inside to verify that your expansion cards, memory, heatsink and video card are still seated correctly. Doing this before you power on your system can substantially increase its lifespan. Also, don't drop it.