I replaced the battery on my A1989 I'm planning to sell, and now the CPU is incredibly slow, to the point booting takes over 5 minutes, the battery isn't even recognized, I can't boot into recovery. How screwed am I, and is there any way to diagnose this?
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I would try a PRAM reset and this is how you do it.
Turn off your MacBook and then press these keys without turning it on: Option, Command, P, and R.
Then, keep holding those keys and press the power button. Nothing should appear on the screen. After 3 seconds, let go of those keys and press the power button. Tell me if this works.
Also, make sure you got the genuine Apple battery for it https://www.ebay.com/p/12031120377
If this worked for you, please accept this answer. Thanks!
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@realroguelive - FYI - You can't currently buy genuine Apple batteries. So while people will imply they are OEM or genuine they are not from Apple.
Thats gotten people into trouble believing Whats written. Some are good and some are rebuilt junk! I strongly recommend you stick with the a real brick and mortar company than the fly by night outfits on Amazon and eBay.
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@metaljulia - I would check the battery using this gem of an app! CoconutBattery take a snapshot of the apps main window and post it here for us to see Adding images to an existing question
You also can run the onboard diagnostics to see what errors it tells you. Restart your system and press the D key, let us know what the errors popped.
Reference: Mac startup key combinations
by Dan
@danj I can't get into a functioning macOS system at the moment because it lost power while making the user and I can't get into recovery. Holding D has gotten me the "online recovery" thing where it prompts for wifi, unsure if that'll give any useful info once it's doing doing whatever.
by Julia D.
@metaljulia - If you have access to a second Mac you could create a bootable drive so you can then boot up under it. The trick is to leverage the startup command Option (⌥) to enter into the Startup Manager, then using the error keys select the external drive.
Reference: Mac startup key combinations
by Dan
Just sounds like a connection issue, seeing how many connections you have to deal with when rplacing the battery in this Macbook, one of them inserted less than perfect can cause booting errors. Its likely just the battery, if a connection looks properly connected it may not be and that extra boot time is your system getting stuck on a connection that is connected but not fully. So I'd suggest double checking all the connections first
by Jordan Fischer