My room mate's macbook (she has the same exact one I do, see sig for specs) won't boot. It powers on, makes the DVD drive sound, no chime, then shows Apple icon. After a few minutes on that, it goes to a circle with a slash through it. I've taken out the battery and looked inside. The RAM on slot 1 had a white powder on it. I took that out and tried to boot from just slot 2. No go. I tried reversing which DIMM was in which slot. No go. I tried just booting with RAM from slot 2 in slot 1. Again, nothing. I turned it off, and put a Leopard install DVD in the drive and turned it on again. It won't boot from the DVD, either. Again, Apple icon, then circle with slash. Please help, any ideas? I'm kind of assuming hard drive failure. I'm thinking about putting my hard drive in her computer and seeing if it will boot.