Not sure how to do that--especially if I can't see my monitor.  
I installed the Dell recommended updates last week (including new BIOS) and now there's no signal to my HP monitor. I plugged the monitor into my laptop and it worked fine, so the issue isn't with my monitor. Is there any solution I can try at home, or do I need to take it to somebody? Thanks for your input!
XPS 8930, updated, monitor has no signal