Okay, I already set the red switch back where it was a long time ago. He told me he was able to get to the desktop when it was at 115v, so I decided to look at other options. I removed the card from the Device Manager and uninstalled everything related to nVidia on his computer. I went to "Add/Remove Programs" and tried to remove "nVidia Display Drivers", but got an error say that "Nuvdisp", I believe, performed an illegal operation and would not let me uninstall it.
I reinstalled the card, installed the latest drivers for it, and everything booted up normally. It was running smoothly on 800x600 resolution with 16bit color. I thought I was done, but I wasn't. He changed the resolution to 1024x768 with 32bit color and it started all over again. We then looked at the drivers for the monitor and saw two plug-in play monitors listed. One would not update it's drivers and the other didn't. We removed the one that wouldn't and everything started working again. I set the refresh rate for the card to "Optimal"
I set the resolution to 1024x768 with 32bit color and restarted the computer. It booted with the 800x600 with 16bit color again. I just hope it doesn't mess up again. I don't know what's more annoying, the card or my bro's "I give up" attitude.