I have macbook pro 17" 2.4 ghz using since Aug.2007 without any problem. 15 days ago while working on it its display seen like this and it was frozen. Now when push the on button same screen appears and I have to force quit. Once I tried command+option+p+r and on button ıt worked well but later same issue happened I could not take it to apple service because there is no here where I am on holiday. please help !!