I bought an older, used Dell Optiplex 7010 mini-tower and although it let me set the boot order to put USB at the top, and I had a USB stick that booted on other computers, I still got a message saying there was not a bootable OS present and the system would not boot from my USB stick.

I even flashed the BIOS to the most current one on Dell’s website but nothing changed.

I then read online about someone who replaced the motherboard CR 2032 battery so I replaced mine. It worked!

Who knew?

I tried to post my findings on dell.com but it let me write the post but then would not let me publish it because I had not yet verified my email address. I couldn’t find how to verify my email address so I am posting it here.