I do online classes, so this morning I walk into my computer room and I get hear my computer, lime the fans working really hard. So I restart my computer, it tells me that it cannot restart, so I shut it Dow, and it turned off..now I cannot get it to turn back on, please help!!! The fan will not run or anything, tbe only thing I can see is a little light blinking on the back. It's a Compaq Vista basic, and its 4 years old.