When I turn on the computer my screen starts to turn on and off after a few minutes for a couple of times to then finally turn off. I then have to force a shutdown to then turn it on in the hope that the screen will stay on this time (usually it will stay on for about 10-20 minutes after the first forced shutdown).
I know it's not my HDMI-cable because before I had the window boot loader alongside the Ubuntu boot loader and there wasn't such an issue when I was on Windows.
I have been researching that issue online to see if others had the same problem. I found some with the same problems and tried all kinds of solutions (like installing xscreensaver and turning off the screensaver).
If there's a solution, please explain it in simple terms, because I'm not that knowledgeable with the intricacies of Ubuntu.