BSOD appeared only once but my computer has been restarting automatic

For the last 8 hours my computer has been restarting automatically. It only stays on for 15-20secs then it restarts. Today is the first day ot has done this. The BSOD only appeared once. I have went into advance system settings to uncheck auto restart just to find it already unchecked. I have did a system restoring point. I was going to try and download a registry cleaner but by the time I type a search into the search box on the internet the computer restarts. Earlier today I was watching something on youtube and there wasn't any sound so I tried to refresh the page because it usually works. But when it didn't I decided to restart the computer thinking that because I had just unplugged my headsets maybe I needed to do tgat well unfortunately every since then it has continued to restart. I can't do anything.