PCI modem (Score 1)

I was working on my PC (one that I no longer have) a few years ago and went into the BIOS setup for something. Then I turned the tower case on its side, removed the PCI-based modem, and turned it back up. I reached for the power switch and I saw the BIOS setup was still on the screen. I hadn't exited or even shut it off. Surprisingly, there were no sparks and the modem still worked later.