second monitor problems

[RR]

I am getting settled into my new place and I can't get my Dell monitor to work my my laptop, the computer thinks it is working but all I have is a black screen. Any advice (or things I can check to see if if the laptop or the monitor is the problem). I just moved so something COULD have been damamged but everything seems ok, but this is the first I have conencted the monitor back to the laptop and I had a bunch of work done to the laptop.