Hello there, I', kinf of new in all apple things. Even if my hadware is old. I just got it. However. I was using it in the most basic way: working online. Suddenly my browser, firefox, stop workin, I tried to closed it but was not possible, later I tried to restart the computer but didn't work eather. So I shutted down in the hard way. Then I turned it on again and after the start up song, the apple image and the disc rowling i was directed to the eternal blue screen. Reading guides about the same problem I followed the steps: Single User mode,safe mode, etc. I can have my desktop when I go into safe mode but not like it supossed to be, I mean, I can introduce my pasword and don't have the blue screen anymore but nothong else appears, just the space image without any other function. I tried to boot form another device, from an USB but it doesn't read it. Cannot get DVD of the OS installer right now. Any advice. Please. I need to write my disertation!! P.S. Sometimes in the blus screen appear some error mesage, like java or google crashed down, but not further action is alowed.