MacBook A1286 momentarily works after an SMC/PRAM reset
As some of you are aware, the A1286's were plagued with GPU issues. Logic board has been replaced some years back, and has worked up until now. I attempted an SMC reset (the only way it will turn on), fans run at high speed long enough to enter the password before showing a horizontal line across the screen and shutting down. The only way to get it to power on is by that method. Attempted to replace battery, to no avail. The magsafe even recognize it. Here is the attempts I have made to revive the computer as follows.
- SMC reset
- PRAM reset
- Replaced battery
- Unplugged fans during boot
- Replaced logic board entirely
Even with a new logic board, it still will not power on without resetting the SMC, to which it does what it was doing before; boots with fans at high speed long enough to see the login, or even shuts down during boot with a horizontal line across the screen.
I've tried everything in the book as far as I have had experience with and still cant figure it out.
Any help is GREATLY appreciated.