Hey guys, i'm new here since this has just happened to me. I was with the messenger Adium on, when i left, then i came back and the keyboard was blocked, the sentences wouldn't come up when i tried to type so i decided to reboot the laptop. when it restarted the grey screen showed up as usual but instead of appearing the apple and then the desktop, there was a folder with a question mark in it instead. i put my ear on the keyboard because i could hear there was a lot of noise coming from inside which makes me think it's not something related with the software or weird downloads' stuff. do you have any idea of what it may be? i hope i don't have to pay another US$300 for the repair... i recently had to get the CD reader/burner fixed and it really hurt. Thanks, Augusta.