[Botany]

You might want to open it up and check if it needs cleaning first. You may have overheated, Next I would take out the Hard drive and try booting it without a HD attached. Next I would put the Hard drive back in and do a complete format/wipe the drive. Either your OS got corrupted or your facing Hardware issues which can be harder to identify.

Do you happen to have a video or tutorial on how to do this?

I would get with taylostolo, he is right on the money. You can also checkout youtube, tons of videos there.