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#11
Ditto!
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.