I've seen a bank atm reboot on a Saturday following a power outage, but they were using OS 2. If the cameras wren't on me I could have held down some keys and gotten into the bios. It was Phoenix 6.02, same as my eMachine. It would have been fun to see if the bios has test features like money dispensing.
I went into the bank a few days later and told the teller they should fire whoever was in charge of security, because they failed to suppress the boot screen. I stood there for almost 5 minutes watching all the stuff go past. When I mentioned that they used Warp for an OS the woman behind me in line laughed, because she knew how old that was. It's so old, IBM is has since dropped support for it.
Bank of America used to have an attached atm in a branch near here that ran Win2000 and had a touch screen. That thing had a mind of it's own. I complained to a teller that it did things on it's own sometimes and she said she knew. She said it was "hateful." Maybe there really was a Ghost in the Machine.