BIOS gave strange "New CPU detected" message

I have four Gateway AIO PC's that are doing something similar.

They were retired from my son's business about four years ago.
I like them so much; I was unable to send them to the Recycle Center.
Recently, I decided to clean them up and reload W7-Pro and sell them.
I tried by replacing the Battery like you did.
Zippo, nada, nothing!
All four reacted the same and essentially did nothing.
They gave no indication of trying to boot into the BIOS.
I'm at a loss as to what's wrong but will leave any additional symptoms or solutions I come across.

Mike Lynch said:

I have four Gateway AIO PC's that are doing something similar.
They were retired from my son's business about four years ago.
I like them so much; I was unable to send them to the Recycle Center.
Recently, I decided to clean them up and reload W7-Pro and sell them.
I tried by replacing the Battery like you did.
Zippo, nada, nothing!
All four reacted the same and essentially did nothing.
They gave no indication of trying to boot into the BIOS.
I'm at a loss as to what's wrong but will leave any additional symptoms or solutions I come across.

Good grief. I can understand the BIOS getting "scrambled" when an unplugged PC sits for a long time and the CMOS battery gets depleted, but to render the mobo dead?

One of my mobos is an Intel and the other is an MSI. I suppose I should look again and see if there are any e.g. jumper resets that can be applied to these motherboards.

videobruce said:

Has anyone considered the 'bad caps' issue/problem from decades ago??

I have not. Will have to look, though neither of my mobos is "decades" old.

BEHIND the monitor!

You might say that/
The Monitor is attached to the rest of the PC by a swivel device.
Like if the Monitor was attached to a wall.
It's totally separate and can be removed and a non Gateway Monitor attached.

I have a Gateway Profile 6 that I've not used in a long time but intend to power-up again this summer, for my garage.