My Dell Dimension E521 is totally non responsive none of the peripherals work. I get a blue screen saying something like " A problem has been detected and windows has shut down to prevent damages." It also says to press F8 select start up then select safe mode " and which none of that can be done..I got some sort of error code STOP: OX000000BE (Ox806CF800, Ox006CF121,OXF78A2788,OX0000000B)