I have a Compaq Presario S4500UK computer. i bought it 2 years ago. the computer crashed and i couldnt open task manager so i turned it off and back on again. it opened fine but the mouse didnt work, so i turned it off. wen i turned it back on the led showing that it was onn failed to light, even though i could clearly hear the fans spinning. the screen stayed black and apart from the fans the computer showed no signs of being on. Is there anyone who can help me?????