All of a sudden in the past few days my computer wont boot on. It has this high pitched sound for like 1-2minutes and the CRT says no signal, then all of a sudden the sound will go away and the computer boots right up. If I shut down the computer and then turn it back on there is no problems its only if it sits for a while. Could it be a power suppy?? Also if you turn off the switch in the back for power and then turn it back on it starts up again, you dont have to push the on button again, wierd????Thanks