My 2017 iMac Pro beeps once every 12-13 seconds, even when shut off.
At first I thought notifications had an issue. Turned them all off. The beeping persisted. So I restarted, and reset the SMC. The beeping persisted. I then shut the iMac down and was amazed when it continued beeping, once every 12-13 seconds.
Anybody ever seen or heard of this?
iMac Pro, macOS 15.5