My computer has recently started turning on for 20 seconds then turning off and repeating infinitely. This has happened before but it mysteriously fixed itself in an hour last time. But this time it didnt it's been sitting in the corner of my room for 2 months I've tested it a few times still doesn't work. I want to know what the problem is so I can fix it or sell it for parts and buy a new PC. It makes weird noises and also beeps twice as you probably heard in the video. I appreciate all the help!