my friend has a 15 inch powerbook g4 and he went to the beach and turned it off befor he left and kept the power cord connected. when he came back he tried to turn it back on and there was no startup noise and nothing on the screen but grey and there are three low beeps and the standby light blinks and then stays on for about 25 seconds and blinks again.. and this repeats. anybody had these issues? and if so what are the ways you fixed the problem. thanks.