Disposals go bad.
If reset is popped out and won't reset when power switch is turned OFF, then that says reset button is bad.
Reset button cannot be replaced on disposal, so disposal is no good.
Your question said you checked following things, but it doesn't hurt to review.
If reset keeps tripping, then disposal has internal short.
Check for power at switch to see if switch is bad.
Check for power at disposal where wires connect.
Put wood broom handle in disposal and see if cutter disk rotates freely.
Use vacuum cleaner to remove unwanted debris from disposal.
I wrote tips for replacing disposal:
When I worked apartment maintenance, we replaced disposal with same brand disposal.
That way we didn't have to change out sink basket or change pipes.
How to: Disconnect p-trap and tailpiece going into disposal.
Rotate connector disk clockwise that holds disposal to sink basket.
Before installing new disposal.
Attach electric wire to new disposal.
Attach dishwasher tube to new disposal. Knock out plug inside dishwasher opening.
Push new disposal up into place, and attach to old sink basket with new connector disk.
Use new connector washer.
Re-assemble tubular pipe.
If this is your home, you want new sink basket that comes with new disposal because it looks shiny and new.
Buy a tub of plumbers putty also.
Remove old sink basket and clean opening.
Put finger-size roll of plumbers putty around sink opening, and then push new strainer basket into plumbers putty.
Tighten basket from below, wipe away excess putty around sink opening.
Install new disposal as described above.
Tips for tubular pipes:
When taking apart tubular pipes, start at p-trap and take apart as few pieces as needed to do job.
On image above, loosen both upper and lower nuts, trap falls loose, and then work on disposal.
Any tubular drain pipe that gets moved while working under sink needs to be disassembled, cleaned and re-assembled.
Metal pipes have rubber washer >> always use new rubber washers.
Plastic pipes have plastic washers > plastic washers can be cleaned and re-used.
Plastic washers have flat side that goes toward nut, tapered side away from nut.
When reassembling tubular pipe, we use rectorseal on washers and joints.
Apply good amount on washer just before pushing washer in place and attaching nut.
Rectorseal will ensure tubular drain pipes won't leak.
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