This morning a little while ago I was sitting here enjoying my coffee and reading post's when I heard a cooling fan on the computer quite then try and start quite and try to start. Checked behind the computer and sure enough the power supply cooling fan was dieing a sloooow death. Shut the computer down before any other damage occurred and started looking through my pile of hulks. Found a replacement and swapped them out. Back up and running!
I'm not sure how long this power supply will last and this computer has some age on it. Maybe it's getting time for one of those fast new ones?