My wife dropped her powerbook on the carpetted floor. It fell flat and not on a corner or anything. We did not think it was too bad of a fall. However, the laptop will now not power up. The screen remains dark, no chimes, nada. The hard drive sounds like it wants to power up but doesnt. Can you guys help me? I suspect it is a hard drive issue, but is there a way to confirm prior to opening it up? I have replaced the drive before so I know I can do it again.