(07-10-2011, 09:34 PM)Vandamguy link Wrote: diagnostics is really just trial and error

you need to try isolating the conditions that make the computer freeze up.
certain length of time , certain load on cpu or gpu , whatever you can think of , being creative helps.

buzzing makes me think PSU , so you'll need some diagnostic tools as well
speedfan is a good one to start with. itll give you info on temperatures and voltages inside the box