The same thing has been happening to me the past few days. Do you have a Compaq? I do. What has been going on with me is that it'll shut itself off at random times. Then, I thought I should just give it some rest, so I shut it off, and when I shut it off completely, it makes things worse. It then does the same thing you're talking about - when I turn it on, it makes one or two of 3 different beeps (one of them being a loud DO-do...kind of like when you'd die in a Nintendo videogame or something lol) and it doesn't come on at all. Today alone it took me a little under an hour of trying to turn it on before it finally worked. I'll finally get it to come on when it'll say to pick Safe Mode or Start Windows Normally and whatnot, and no matter what I pick, it'll still screw up a few more times. Eventually I'll get it to work like I did now, but then its just open season for whenever it decides to restart itself. Idk what's going on but its really getting annoying.