Help Dell optiplex 9020 internet and monitors stopped working.

I had a hackintosh dell optiplex 9020 that I was using as a headless machine that was connected to my internet through an ethernet cable and I would just share the screen if I needed to do anything on it. Today it won't connect to the internet and when I plug a monitor into it, it doesn't work. Any ideas on how to troubleshoot it without it connected to the internet and no monitors?

submitted by /u/WorkingVomit
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