my computer has a black screen after i updated my bios

I've been trying to deal with the black screen issue for the last 2 days with no success. I don't have a 2nd monitor to try and resolve the "phantom screen" issue if it is in fact sending a signal to a non-existent monitor. I don't have a way to reset to the previous OS.

It wasn't my idea to update and now I'm stuck with this black screen and a cursor that can do nothing.

If anyone has any other tricks up their sleeves, I could really use the help.

Turn off PC, unplug power chord from outlet, push and hold start button for 10 seconds.....remove side panel, find CMOS battery and remove it for 5 minutes. After 5 minutes, reverse the above process and turn on PC.