My Asus computer wont stay on for more than a few seconds. It starts booting up then goes dead. Ive tried to reset it by removing the battery and holding the power button for 30 seconds but it hasnt helped. Ive swapped out the power source to check that it wasnt my cable, but its still not turning on. It has been randomly shutting off when Im using it,and has been for some time, but now it wont turn on at all. HELP!!