Black screen, solid sleep light and max fan speed boot failure
I have a Macbook A1342 that’s currently not booting up.
When I press the power button, one of two things will happen depending on power source:
MagSafe charger connected - upon pressing the power button, the machine will turn on. However, the sleep LED is solid white and screen is black. After some time, the fan slowly speeds up and then it cuts off. After this, it’ll automatically reboot and after a bit, the fan will spin very fast. It’ll remain this way until I cut the power. The screen is black the entire time and the sleep LED remains solid white if the machine is on.
So first power on results in a rather quick power off just as I hear the fan rev up, and it’ll reboot and this time not cut power, fan then hits full speed and stays this way.
Battery - it will simply reboot loop. It will wait until the fans start speeding up and then cut power, and reboot. It’ll keep rebooting itself until I disconnect the battery or hold the power button.
This happens with RAM seated or not seated. It also happens with just the board and fan connected outside of the Macbook’s case.
Any idea what might be wrong here?