My M1 MacBook Pro was in its sleeve for a couple of days and is now completely unresponsive. I don't know its charge level when I put it away, but the battery health had been good.
I've charged it overnight, held the power button, disconnected the battery briefly, and tried different ports, cables, chargers and outlets. Another Mac doesn't detect it when I try DFU mode. The board has no obvious damage. What should I try next?
I'd have a repair technician diagnose the power circuitry at this point. A board can look perfectly normal and still have a failed component, and good battery health beforehand doesn't rule out a battery or power fault.
Ask for a diagnosis and estimate before agreeing to a repair. Mention the attempted DFU connection and that the battery was disconnected, since both are useful context.
Before giving up on DFU, double-check the exact port and button sequence for your model against Apple's instructions. Use a USB-C cable that supports data and connect directly to the other Mac, not through a hub.
If it does appear, a firmware revive is the less destructive option to ask about first. A restore erases the Mac. If it still doesn't show up after a correctly performed attempt, that alone won't tell you which component failed.
A dead display or backlight is another possibility, though it wouldn't explain every symptom on its own. Shine a light closely at the screen and look for a faint image, and see whether the trackpad clicks or the Mac makes any startup sounds.
Those checks aren't definitive, but they can help tell a technician whether the machine shows any sign of starting.
The slight buzz you can feel on the case isn't proof that the Mac is charging or that its internal power circuits are working. Since you've already opened it, I'd stop disconnecting parts and leave further electrical checks to a technician.
If there's any smoke, unusual heat or a burning smell, unplug it and don't keep trying to power it on.
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y7+aluop:
If the data matters, say so before authorizing a board replacement or other work. Ask what the proposed repair would mean for the data.