Irregular colorful display & crashing issues

Dell laptop - display & crashing issues

I have a Dell XPS L502x which I now use mainly as a desktop replacement and connect it via hdmi to an external monitor. While working I will usually get an irregular colorful display on my monitor (as seen on the photos attached), sometimes it only lasts for 2-3 seconds and then I can get back to work and sometimes the laptop freezes and I have to reboot it.

Can anyone help identify if this is a hardware issue? If so what kind?

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Difficult to imagine what kind of fault would cause this but it would be worth eliminating the cable and the monitor itself by trying different ones.

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