My early '06 iMac won't boot, just clicks with question mark on screen. SMC reset, Pram reset can bring it up, works OK for a day or two, then back to no boot. disk utility finds no problem with disk

anytime I get it to boot, it works for a day or two then goes back to the Question mark screen.

Hi! It could be HD issue. You should back up your data in the computer first when you can boot to normal desktop. boot to install disk to run disk utility - if it got error over there, you should bring the computer to repair centre to fix it. You also could try to erase with zero out and install again And see will that be fix the issue! 

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    Message was edited by: strathglass

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