I charged the battery to 100% (worked fine) and started it. Everything worked, except that I cannot start on battery. The battery itself is fine, so I can connect the charger, hit the start button, and it starts. I can then disconnect the charger and it will continue to work. But without the charger, it just won't recognize the press of the power button.
I tried to reset the SMC (Shift + Ctrl + Option + Power button) and reset the PRAM (Cmd + Option + P + R like 5 times), but nothing has changed .
My MacBook Pro 2009 (A1278) has a problem. When I turn it on, it displays a flashing folder with a question mark. I've tried most of the options I've seen, none of them showing any sign of doing anything:
Command and R simply shows the missing file
Command Option and R Displays the Missing Folder
NVRAM Reset does not do anything
The only thing that shows signs of progress is to hold down the Option key after turning on the power. It shows an empty screen with a mouse cursor that I can move.
Very rarely, it shows a glowing globe with some kind of hard drive underneath, but it disappears again in a few seconds in the mouse cursor.
I've even tried putting an external hard drive formatted for Mac, but my MacBook does not recognize it at all.
Is this a problem with the cable plugged into another SSD while I have an external SSD? I have no idea.
I have another MacBook with me that has helped reformat the external hard drive for Mac.