Hi alchemist

Can you give us details of what happens if you do a cold boot with both the monitor and PC initially powered down.

Like zENGER I have never encountered this before, or even heard of it.

First thing I would do is power down the monitor and detach it from the PC, then power it up unattached. You should get some "no signal" or possibly a test chart. Power down and reconnect to the computer, that might clear it.

Unfortunately I have a sneaking suspicion that one or more of the buttons is broken, and has locked "on" so that you cannot get out of the menu?

I have an IBM G54 on the other side of this room, so I can do some testing if you give me a few more details