Hi, I have an old laptop, sometimes it just randomly crashes and goes flashing colours like the attached image. Might be when I’m processing lots of things. A diagnosis and solution would be very helpful. Please look here: Image Video
it might be getting hot or the gpu could be getting hot bad ram maybe. clean the laptop open it up and clean all of it using a non conductive non corrosive liquid with non abrasive static friendly cloth or wipes . i had a laptop one time that the screen would start flickering but it was a lose lcd cable.
Is it getting hot? As you said it's old, it could have some dust inside of it, so remove the case and have a look, also try to change the thermal paste.
it might be getting hot or the gpu could be getting hot bad ram maybe. clean the laptop open it up and clean all of it using a non conductive non corrosive liquid with non abrasive static friendly cloth or wipes . i had a laptop one time that the screen would start flickering but it was a lose lcd cable.