Display flashes turns into vertical grey lines

[Gregg94]

Ive had the PC for about 6 years and just recently on start up the display will flash with a few horizontal lines of blues,reds and greens before turning either completely blank or with lots of vertical grey lines of different shade. If this doesn't happen on startup it usually happens when I'm watching a video. It doesn't go away, the only fix I've found is to shut the PC down by holding the power button 

Please can someone help

Many Thanks

[Barachiel]

@Gregg94

Good Day. A warm welcome to the HP community. 

I reviewed the case regarding issues with the computer's display. I will be delighted to assist you here.  

Superb description and terrific observations made before posting. Kudos to you for that. 😉 

Follow this document which will lead you to a guided troubleshooter, which will provide you step by step instructions. By the end of the document I'm sure the issue would be resolved. 🙂  

This should do the trick for you.Please perform all these steps patiently as it is critical to resolving the issue.   

Hope this helps. Let me know how it goes. 😉

[Gregg94]

Hi,

Thank you for responding 

I followed the troubleshooter agent you sent me and although very helpful, has not resloved the issue.

Luckily I backed up all my data before this happened, so would a factory reset potentially resolve this issue? As I'd rather try that before I send it off for repairs 

Thanks again! 

Gregg

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[Barachiel]

@Gregg94

Thanks for the response.

Yes, give it a try and let me know. 🙂