Hi Guys, I've an early 2006 iMac that has started to mess around and was wondering if you could help me. It has recently started to turn off randomly as in completely power off. After it does this it will not power on unless it is plugged out and left for 5 minutes and then it'll work for awhile and do the same thing again. Does anyone know what would cause this? PSU, logic board, RAM? Just wondering if it's worth while fixing it..... it's not software as I formatted the hard drive and was installing Snow Leopard and it happened again. Also some side questions: I know the late 2006 logic boards can be used in this model (the core 2 duo models) but could is it possible to fit a 17" logic board in a 20" iMac?