Lines across my screen

So I was on my computer and suddenly it went really glitchy and then a error came up saying
Then it restarted and when it came on it had lines all over my screen
My pc still works perfectly fine and I have had a look Into the problem. Here are some things I have done and didn't work :
Check if it was a monitor problem (it wasn't)
Went into safe mode (No difference)
Went into bios mode (no difference)
Updated drivers (no difference)

So please can someone help?

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Clarification Request
Remember there are priors on that error.

I looked over the usual google to find virus, trojan, failed hardware and more.

If BIOS screens show this defect it's likely to be a failed video card since no OS is running.

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So I will have to buy a new card?

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You can use it as is till it just fails.

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most likely

open the case and make sure all cards and cables are plugged in properly. also make sure it is dust free. sometimes that will solve similar problems.

if you tried another monitor and still had the lines, then most likely a new card is the next step

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motherboard model?

That's general alternating current "static" bleedover from something. Last time I saw that pattern it was failing capacitors on a motherboard or video card. So, this an older motherboard with the older electrolytic capacitors? Or some of those on the video card? Also a failing fan on a video card can cause similar patterns, but less likely.

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If a laptop screen, then replace the video cable that goes from mobo, usually through a hinge to the monitor. Because of constant opening and closing the wires break from metal fatigue.

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What should I do

Thanks for the reply
But what should I do?

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laptop or desktop?

You do need to give some information. Make, model, if you know the motherboard model that helps. You can google "bad caps" and "capacitor plague" if an older computer and learn how to check visually for those. If a laptop, there are various youtube videos showing the cable and how it's replaced if that's the problem. I can not divine this, you have to give information too.

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