it doesnt just crash as in closes apps or gives me a kernel panic icon it really freezes up and doesnt let me do anything, the screen stays the same but nothing will move. If music is on it loops over and over again basically stuttering. I have tried everything under the sun, ive ran diskwarrior and techtools pro and everything checks out. Ive changed round all the memory modules i have and still no difference. It is really anoying me, i dont really want to phone applecare cause the charge alot just to chat. Has anyone heard of this before? mine has done this for months any help would be appreciated.