Problems: Constant grey screen asking me to restart. Looping of log in screen when restarting. Having to boot in safe boot. Finder constantly lagging just hitting an file for quick preview no matter how small. All this continues even after a clean SL install. Could it be the hard drive? Crash report said something about a problem with the CPU, screen capped it twice, disappeared off my desktop along with a few other files. Now is my 2007 MBP 2.33GHZ screwed? Should I just attempt to buy a new one? Mind you, my old MBP has never given me a problem until a month ago. It's my sole work computer and I really can't afford a new one.