The switch button was not in the best shape and I am using the notebook like this for more than 5 years, trying to not physically touch the button, using shutdown/restart/standby commands but anytime I was force to use the power switch it works fine. Suddenly the notebook started to shutdown by itself and I have a hard time keeping the power on. Sometime stays on days, sometime just shuts off in 2 minutes. Sometimes it starts by itself on and off 5 seconds cycle. First I thought the power switch is gone but the switch is just a short that can be made between 2 wires to initiate the POST and this is accomplished but why does not keep the power on? I monitored CPU core and ISA temperature and maximum was 60 Celsius (when laptop was ON) average 40 Celsius. I check and clean fan and MB (no dust deposits). I tried to power on battery only or power source only and same symptoms. The most intrigue is why is starting to boot by itself when the laptop is power off state (NOT STANDBY/SLEEP)? Any help would be much appreciated, thanks!