Green Lines on Editing Screen

I have a problem trying to resolve an issue with green lines showing on the editing screen of my laptop, and have looked through previous similar posts but just can't sort it out despite following advice given!  I'ts been like this for about a week (24/11/20 today) and have updated to the most recent Premiere Rush version just today, but no change, however I can still edit unrestricted on my phone app.  The laptop isn't probably the best but has worked, although a bit slow, over the last few months. It's a HP laptop with 4.00gb RAM, the processor is an Intel(R) Celeron(R) N4000 CPU 1.10 GHz (i've checked that and its also the latest update!)   I'm not that great with computers so sorry if i'm talking rubbish but I don't know what else to try!!  ps. i do intend changing the laptop but just can't afford to do that at the moment and would hate to do so and find that nothing changed.