Chosen Solution
I need some support advice for my 2009 Macbook Pro Core2 duo. After a while of not beeing used, but still connected to the charger, the computer would not start any more. The battery status is responding, all LEDs show green, fully charged. The charger connector shows the same, green LED on, battery fully charged. I tried the SMC resetting procedure, no effect. I opend the case, checked the cables, it all looks fine. Also unpluged the battery and pressed the power button 10s, waited 30s, reconnected, no effect, also no SMC resetting shows any result. The powerbutton and the loudspeaker are wired together to a 4pin connector. I tried to measure if the power on switch is working, is always shows 7.5Ohm, connected, unconnected, and unconnected with pressing the power connector. Is that normal? Any other check that can be conducted? Thanks a lot for any further acvice.
Try plugging in a new keyboard. Remove and check the logic board for liquid damage. The power button and speaker are not wired together, the power button is a part of the keyboard on this version. Do this first, then take it from here.
