My Macbook is seriously slowing me down now. I have 20GB of HD left and it's still slow. Sometimes it takes a while to load Firefox. When I first got it, it was so fast. Is there like a "refresh" button on my Mac? Or a defrag program? Or something? Sometimes it freezes when I try to shut down and I gotta hold my power button till it goes off. Another problem is the iSight. Whenever I'm doing some video work, Garageband work or just plain surfing the net, my dad calls me through Skype and the iSight doesn't work until I restart my computer. Why is this happening? I have nothing running in the background, Photo Booth is not running, MSN is not running, nothing besides Firefox. It's really starting to annoy me.