Stiil no luck with Kodi or youtube in browsers

Ok, I have now done countless fresh installs of Ubilinux 3.0 (4.4.0-ubi3-amd64), trying to get kodi or youtube in a browser to run but no luck.
I have a wired network connection, so no WiFi dongle issues should cause any problems.
Every time I do a fresh install, and then
Then I do
So far so good....
Then I do a reboot, and when I'm logged back in, every time I try to play a youtube video in either Chromium or Firefox the system crashes with a X screen of death, where X is a random colour. This also happens when I try to run kodi.
What is going on
????? I have spent money on 2 wifi dongles and on a long ethernet cable (just so I could try the wired connection) and still I cannot seem to be able to do what I bought this board for - running a media center. I have a feeling there is something with the graphics libraries here....
Please advise, as I am all out of ideas here....
A very frustrated Danny
I have a wired network connection, so no WiFi dongle issues should cause any problems.
Every time I do a fresh install, and then
sudo apt-get update sudo apt-get upgradeSo far so good....
Then I do
sudo apt-get install kodi sudo apt-get install firefox-esr
So far so good....
Then I do a reboot, and when I'm logged back in, every time I try to play a youtube video in either Chromium or Firefox the system crashes with a X screen of death, where X is a random colour. This also happens when I try to run kodi.
What is going on


Please advise, as I am all out of ideas here....
A very frustrated Danny
Comments
Correct, a DC supply rated 5V/6A should be more than enough. Still, from the symptoms you describe, I think it would be a good idea to try a different power supply (rated at least 5V/3A). Reasons detailed below.
On its own, this doesn't necessarily mean loss of mouse/keyboard if you have lost your display. Ctrl-Alt-Del doesn't reboot on the default ubilinux desktop, but brings up the task manager instead. However, Ctrl-Alt-F1 (to switch to a virtual terminal) followed by Ctrl-Alt-Del *should* reboot if the board was still responsive...
...which it doesn't appear to be. Power/network LEDs turning off seem to suggest an unstable power supply. As for the solid color in the display, we have experienced that exact symptom along with a CPU hang when using power supplies that can't deliver enough current.
CPU still on, sure. Probably not actually running the OS though, from our experience.
Thanks for your detailed report!
Is the 4A of current still not enough to drive the HDMI display controller properly? To test that, I have ordered a different 5A/4A PSU to double check 4A is definitely not enough, as well as a 5V/8A PSU as a back up.
Will post an update when I have tested the two PSUs....