Earlier today, in a moment of frustration, I did one of the dumber things I have ever done. Irrationally, I slammed my fist against my keyboard on my Macbook (which I think uses OS X 10.4). Afterwords, my mouse was not working and I could not get any programs to open. I turned my laptop off, hoping that it would work again upon being turned back on. Unfortunately, while my computer still makes the noise it usually makes upon being turned on, all that comes on is a white screen. My friend suggested that I had messed up the hard drive and would probably have to get a new one. Any ideas on how I might be able to salvage my computer, or if this is even possible? Any suggestions would be ever so greatly appreciated.