Originally Posted by
Bxmarg
A while a go the hard drive on my iMac went bad. There was a power outage and I afterwards it would mount But then a few days or sometimes hours latter would freeze up. Anyways I replaced the hard drive and used time machine to put things back in order.
But it sounds like a hardware issue. So first try running disk repair (in the applications\utilities folder). Then repair your permissions (also done from disk repair).
Other thing to try is see if you have a memory leak. Fire up activity monitor (also utilities folder) and see if anything is slowly draining your memory to zip.