just recently I wanted to turn on my computer but the screen turned blue with a few explanations saying that windows shut down the computer to protect it from harm... it tells me to press F8 to start in safe mode ...other things such as ...or disable boot and sampling ... I have tried all the options on F8 but nothing happens, the blue screen opens again. I also press 'delete' for set up but things seem normal... what can possibly be the problem and what can I do to solve this because I still can't use my pc?