I was messing around in my properties and I turned my plug and play monitor on and set it as my default monitor instead of my dell one. Now whenever I turn on my computer it goes to a black screen and nothing shows up, or sometimes my desktop shows up but there's no icons and when I go back to properties it doesn't load 
. I'm in safe mode right now but I don't know what to do to fix this problem because when I go back to properties in safe mode it won't let me change my monitor back to my dell one that I use. Pleease help 
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. I'm in safe mode right now but I don't know what to do to fix this problem because when I go back to properties in safe mode it won't let me change my monitor back to my dell one that I use. Pleease help .