My Apple II+ (golden) power supply can switch on my Apple II (non-plus) just fine.
However after 2-3 minutes it powers off. The only cards I have attached are a 16K memory expansion and a Disk ][ drive controller.
A replacement power supply does not suffer from this problem.
Any thoughts on what might be wrong?
I have moved this to the hardware repair forum.
Apologies for the duplicate posting.
I deleted the duplicate in Hardware Repair. This is the best place for your query, anyway. The problem is almost certainly a thermal shutdown, so perhaps one of the Apple II experts can advise.