I am going through the list of reasons that one would find the question mark folder Here is what I have come up with 1. it can't find your OS, so try safe mode, or booting on to the snow leopard install in to disk utility and see if you can see your disk. 2. if no disk or nothing to repair- proceed with trying another hard drive (to do this I have an external usb enclosure with a snow leopard test install on where I can first verify the computers ability to even boot to an OS w/o a kernel panic or). 3. put a new hard drive in and install snow leopard on 4. if drive is still not recognized replace the hard drive cable as a second to last ditch effort 5. IF ALL THIS fails. It's down to the logic board...is it not?