Will not boot, no startup sound, dead but charges battery
This is a 17" MBP A1212 2.44Mhz. There is no startup sound. Nothing happens when I press the power button. The MBP charges the battery. No chime, no light, no fan, complete silence. I tried the reset PMU, changed RAM to make sure and about every trick Mayer suggests on other similar topic. Have no idea where to start! Can it be the DC-in board even if the battery charges?
Resetting PRAM and NVRAM
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
If nothing happens, reseat the keyboard to logic board cable.
If you can start the computer by shortening the PWRBTN on the logicboard i guess that something has fried your topcase. Try to get another one. Sometimes the USB contoller underneath the trackpad fails, but that wouldn't affect the power button. Carefully check the flatband cabel that connects to the board. From the distance i suspect that to be the culprit.
Hello, I would like to suggest to you to get another ribbon for your entire top case cover. Chances are that there is a "BREAK" somewhere within that ribbon cable (most likely right at the connector head). These type of cables can only stand so much bending, if you keep bending it up (as in removing the top case cover a lot) you can cause a break at critical points on that cable. You can go to EBAY and purchase a use one for a minimal price since it is not a highly sought after item.
Hi, you can obtain that ribbon cable on ebay, the cost will not be that much at all since it's not a "HIGH" selling item but you will find some there. Now in "jumping" that cable to see if it is shorted, well I would not attempt to do that due to the possibility of creating another problem elsewhere in that electrical circuit. It's worth the wait.