Urgent help, magical GPU

justinnn

justinnn

justinnn

Associate
Joined
25 Jan 2026
Posts
16
Location
UK
Hello,

I bought an rtx 4080 super which I enjoyed for a three months when one day it randomly powered off during emails and made the pc just instantly click and nothing spins or happens, when I unplug the cable it lights up. Until I get the courage to pay for a repair, I decided to buy an rtx 3070. I put it in, and now a new issue it takes like 10-15 tries powering on and off, unplugging from mains until the monitor displays an output once thats on then its fine until the next power off.

I tried uninstalling the GPU drivers and installing fresh ones for this (using DP to motherboard as then its fine), once restarted it all booted perfectly until this morning again the same issue.

I tried resetting bios, checking that the gpu is firm inside the socket, cables etc all the basic stuff.

Any ideas? Its something with the handshake between monitor and gpu maybe..

Thanks
 
From the Rtx 4080 super I did check the connectors, everything physically with the card and cables looks immaculate. I saw a few people had the same exact story on reddit

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Anyways, as much as I would like to fix it I doubt its an easy fix and its something inside.

Now with the rtx 3070 everything is fine with the card just something magical going on thwt everything boots but no display, after long time fiddling around daily like 30min of power on and off, timing the monitor with the gpu etc it works.
 
Did you check the pins on the PSU side too?

Do you have an iGPU on your CPU? i.e can you remove the graphics card altogether and see if you still have the problem?
 
justinnn said:
Any ideas? Its something with the handshake between monitor and gpu maybe..
Click to expand...
justinnn said:
Now with the rtx 3070 everything is fine with the card just something magical going on thwt everything boots but no display, after long time fiddling around daily like 30min of power on and off, timing the monitor with the gpu etc it works.
Click to expand...
If that's the problem, you could try switching between DP and HDMI, or using an adapter.
 
Rob_B said:
Did you check the pins on the PSU side too?

Do you have an iGPU on your CPU? i.e can you remove the graphics card altogether and see if you still have the problem?
Click to expand...
So with integrated graphics from motherboard everything boots properly. The pins all seem fine if anyone had knowledge and could walk me through I could take the 4080 apart and check which capacitor went wrong if that would help.
 
Tetras said:
If that's the problem, you could try switching between DP and HDMI, or using an adapter.
Click to expand...
HDMI doesn’t wake the monitor at all, the DP atleast sends a signal says no signal and turns off (With the rtx 3070).


4080 as I said when its in the PC nothing lights up or boots some safety mechanism doesn’t let anything run.
 
justinnn said:
HDMI doesn’t wake the monitor at all, the DP atleast sends a signal says no signal and turns off (With the rtx 3070).


4080 as I said when its in the PC nothing lights up or boots some safety mechanism doesn’t let anything run.
Click to expand...
You could try a firmware update for the monitor and/or card.
 
You said it does eventually boot? Or use iGPU.

Given problems occur when you install either GPU I'd hold off taking the card apart, would suggest a PCIE slot issue (change to another?) or PSU (check/swap cables and connections) or BIOS (reset it?)
 
Rob_B said:
You said it does eventually boot? Or use iGPU.

Given problems occur when you install either GPU I'd hold off taking the card apart, would suggest a PCIE slot issue (change to another?) or PSU (check/swap cables and connections) or BIOS (reset it?)
Click to expand...
So the RTX 4080 worked for three months until one day it turned off and couldn’t boot it. I tried multiple PCIE slots, it creates a click and no lights no nothing starts. Until I unplug the cable then it lights up but obviously power not connected so not good.

The 3070, I really don’t know the pattern but after spending like 30min-1h it eventually gives me video output. I also tried reseating the gpu, using seperate cables instead of daisy chain, uninstalled all video drivers (whilst using internal graphics) and updated them.

You guys are fairly knowledgeable so would be curious on your opinion to the reason why an 4080 just died like that, but also the mystery behind why a 3070 takes so many power cycles to give a display.

Thank you in advance.
 
when I unplug the cable it lights up
Click to expand...

Please tell me you didn't do this when it had power going through it?

Where did you buy the 4080 from and wouldn't it still be under warranty?

If the 3070 haas problems as well I would say your issue lies elsewhere such as the motherboard or psu. Have you tried either card in a different pci-e slot on the motherboard? What make and model is the psu?
 
pastymuncher said:
Please tell me you didn't do this when it had power going through it?

Where did you buy the 4080 from and wouldn't it still be under warranty?

If the 3070 haas problems as well I would say your issue lies elsewhere such as the motherboard or psu. Have you tried either card in a different pci-e slot on the motherboard? What make and model is the psu?
Click to expand...
Yeah from the pcie slot. Tried multiple ways, well 3070 is completely different its just something with it not starting properly or sending a signal and taking multiple tries.

Whereas 4080 is just drmos so nothing I can do with that one.
 
Tetras said:
I doubt it would do you any good, this kind of repair needs specialised electronics skills/tools and a proper diagnosis by someone who knows what they're doing.
Click to expand...
There are ones on eBay doing repairs, you send them the GPU and they fix it but they have a couple bad reviews so quite scary and they can make stuff up and charge more than needed, should be around 200£ for drmos replacement.
 
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