Anybody else run into this problem...? I have a 15" PowerBook G4 1.5Ghz and when it has not been on for a while and is sufficiently cool... I press the on switch and it starts up just fine. But when it has been running and warms up, if I turn it off and try to turn it back on before it has had time to cool... it will give me the initial start-up chime and that's it. The hard drive doesn't even start to spin up. So I think it's a bad switch. If that is the case, how hard would it be to replace? Any soldering required, etc.? I know I can get a switch for about $10 and it would be worth it to have it working properly. Leaving it in sleep mode and never fully powering down is a little annoying. I appreciate any input people may have.