So I took my 2006 iMac in to the Geniuses at the Apple Store yesterday after suffering some serious Grey Screen of Death, and as I feared, the prognosis was fatal: fried logic board. This is also what felled my old G4 tower. I seem to get about 5-6 years life from my Macs. Right now I'm in a holding pattern using my wife's MacBook and my PC laptop for work, waiting for the new Macs to be unveiled this month (hopefully). My hunch is that I'll go for another iMac, depending on how the prices and specs fall. Anyway, in mourning the death of a computer that served me very well for five years, I got to thinking about the issue of logic board malfunctions and what can be done to avoid them. Genius at the Apple Store talked about the importance of turning the computer off vs. putting it to Sleep, saying the idea that powering a hard drive on and off taxes your system is a myth. I Googled that and of course opinions on this are sharply divided. I also got to thinking if I need to invest in a better surge protector, or possible even a power conditioner, like the Furmans I see used by musicians. Any thoughts on all this? Or is the general feeling that logic boards on most Macs are destined to fail in computers that are used every day?