User level: Level 1 (4 points)My MacBook Pro i7 won’t turn on. When I opened it this morning it told me it restarted due to an unexpected issue then won’t turn back on. It charged all night and is plugged back in now.
Posted on Sep 17, 2026 5:23 AM
User level: Level 10 (148,617 points)Sep 17, 2026 10:16 AM in response to kaz-k
plus one more possibility, but probably not applicable in THIS case.
Battery completely discharged:
Running the battery down to zero is a possible cause of such a problem. A completely dead battery can drag the Voltage down too low for anything to operate.
That includes the System Management [micro-]Controller (SMC) in an Intel system that controls clock speeds and re-charging the battery by initiating a Charge Cycle.
However, trickle-charging is possible (but not guaranteed).
Connect the power adapter and leave it connected at least overnight, in hopes of applying a tiny trickle charge to the battery. Later, encourage it to start up (with the Power Adapter connected).
IF it can get enough power from trickle charging, it MIGHT be able to start the SMC or the background processor, at which point it can initiate a Charge Cycle and break the deadlock.
User level: Level 9 (53,902 points)Sep 17, 2026 8:50 AM in response to Hollyrw
Originally posted at discussions.apple.com/thread/256358905