My problem started earlier today when my 2006-era Macbook froze. I did a forced shutdown (held the powerkey down) and then tried to restart it. The screen flashed, turned on and I heard the startup chime but there was no Apple logo. After waiting a few minutes, a flashing folder with a question mark appeared. I then tried the following: Safe-boot (held down Shift-Key), "Option/Alt"-boot, resetting the PRAM. I checked that the RAM was seated correctly, and checked if the hard drive was inserted correctly. The optical drive on the Macbook does not work so I was not able to boot to the Install DVD. The computer was running OSX 10.6 (Snow Leopard). After an afternoon of research (I am kind of new to computers), I was pretty sure that the hard drive was fried but to confirm it I went and grabbed my sisters Macbook (2007-era, OSX 10.5). I put the hard drive from my computer into hers to see if it was a logic board issue instead of a hard drive issue. It did not boot and I was met with the same grey screen with no Apple Logo. I then inserted the OSX 10.6 install DVD into her computer to open the disk utility because the optical drive works on that machine. The DVD eventually loaded after about 4-5 minutes and I attempted to open the Disk Utility. The screen turned black and the machine shut off. Next, I put my sister working hard drive into my broken Macbook; the drive booted perfectly! From this I deduced that the hard drive on my computer was probably fried but the logic board, RAM and other components where working fine. Does anyone have anymore tips or tricks to try? I have had to erase and install the OS once before on this hard drive but without a working optical drive I can't use the disk utility. I am afraid to load my hard drive into my sister's computer again because of how it ended when I tried it initially. Any help is greatly appreciated. Thanks!