Thank you for the detailed troubleshooting advice.

Going to take me some time to order a new PSU, but I'll post back when I get to do a test run with that.

So, you replaced the pre-installed image SD card bought from Pi Hut, and went to the store and got yourself an HC-1 micro sdcard (such as the $11 Samsung EVO+ 32GB HC-1/UHS-1), right? Then downloaded and install Jessie full, and then expanded, and then updated/upgraded it, right? Yes. Have now two ...

Posting the results of that test is beyond my skills, since I cannot copy/paste in the graphical interface or launch a web browser Power supply is insufficient then. Are you not using a keyboard mouse with monitor? Why cant you copy/paste in the graphical interface or launch a web browser? What hap...

Lets start over (cuz I am easily confused). troubleshoot process of elimination: Did you connect anything to the gpio pins, and/or short them out? Run this for 15 min (do not use pi3 when it is running, then click 'select all', copy, then paste results in Code tags) while true; do vcgencmd measure_...

But yes, the power led is continuosly lit. I've now tried 3 power sources, all with 5V and 2A specs, no difference. They all of course give slightly less current (0.5 A) than the official Pi 3 psu. To my knowledge, this shouldn't be a problem though.

Maybe. Does this sound like a typical problem of a too low current?
I'd have to order the official power supply from abroad, haven't found the 2.5 A version from my country yet.

Done that now for one card. Not sure what to do next though. I bought a third SD card (Sandisk Ultra) 32 GB and installed latest Ubuntu Mate on that. Same problems with that one as well. Tried with the default gpu mem and 256, no change. At this point I'm pretty sure that the issue isn't with the ca...

Changed it to 192 but still just a black screen and freeze. Earlier it worked with the default 64 (except for the initial problem) so guess I've managed to break it more so far

Your error with memtester is that you tried to get more memory then is available. You have to leave enough memory for the system. Set gpu memory to 48, reboot, then; memtester 700m 10 Ok, set gpu mem to 48 and did the memory test with said parameters. I saw the two first loops which were ok, then w...

Often it is a good idea to pretend like you are Noah with these sorts of things and buy two of everything. It's much more difficult without swapping parts because you can't just try something else when you think you've got it narrowed down. Try configuring just Raspbian on a card booting to the com...

Done that now. Launched Raspbian to command prompt and started to run a short video on continuous loop in omxplayer. Didn't use a script though, but instead the --loop command on omxplayer.

Current OS installed is Lubuntu, and df -h shows 5,1 GB of available space for /dev/root. So that can't be it.

I think during that Raspian screenshot I had OpenELEC installed as well. Before that I had just Raspian installed so there was more space and still the same problems.

Hi! I just bought my first Raspberry Pi, but I'm unable to use it properly. I first installed Raspian from a Noobs pre-installed SD card. Unfortunately all the texts/icons soon became scrambled and every program I tried crashed. I then formatted the SD card in Win 10 with SDFormatter, using full for...