Computer Wont Work!

Okay,

To start my wireless router was working wirelessly but my LAN was not on my Desktop.

I got frustrated and kind of hit my desktop on the side and now after restarting (since LAN wasnt working) my monitor says "no DVI signal"

Could it be my PSU or my VGA?

Idk how to check and im so upset because it's midterm week and I NEED my PC

Thanks

BTW to turn my PC off I unplugged my PSU instead of doing a proper shutdown sequence >.<

AND it wont work on my TV from HDMI and it's NOT the monitor since it works with my xbos