This computer is using windows xp, last night it was working fine i cut if off went to sleep i wake up today cut it on as usual but the computer gets no video signal and the computer stays running real loud permanently like it should only do for the first 10 seconds of boot where the case fan runs loud. And now when i power on the pc it shows the HDD activity light on for about 20 seconds then it goes off while the computer is still just running loud and nothings booting up. So what could this be? I cant boot into bios safe mode or anything.