Strix 1080ti recently stopped displaying a picture on either monitor, no clues - Hardware & Software

I bought this card off someone on Ebay back in April for £720, I believe said he had it for about a year or so before selling it on for whatever reason, I can't remember the reason however but I'm pretty certain it wasn't a mining card, I don't recall him ever mentioning anything like that and I'd like to believe he's honest enough given, at the time, he'd gotten 1290 feedback off people he'd sold items to, of which the feedback was 100% Right now I've emailed him to get some more detail about the card's usage to make sure I know exactly what it was used for and how long he used it prior to selling it on, because the information I'm remembering is what I remember him telling me back in April, see what's what on that. So far with the card though I've had absolutely zero luck in getting it to display anything, when I boot my computer the RGB shit still comes on, the power lights (2 of them) show up with the power cables plugged in, but I get no picture on any picture, display port or straight HDMI, it only just started doing this as of yesterday my time, around late afternoon, I'd brought my computer out of sleep mode, nothing unusual there, but no picture at all, I restarted, still nothing, I got my computer up on my desk, I took the GPU out, blasted it with some compressed air to make sure there was no dust issues, it was already fairly dust free, I changed the power cables plugged into my PSU to another slot, I unplugged my HDD and 2 SSDs to make sure it wasn't some boot issue, I took out the RAM and changed the slots, the CPU is perfectly fine, the PSU is also perfectly fine, I swapped out my Card for what I thought was a 980 but was actually a 760, but, on both those cards the display functioned properly and without issue, I even removed any card from it and booted with just a HDMI Cable plugged into the Motherboard, also perfectly fine, also went with unplugging everything but my mouse and keyboard, I also have a USB Extension Card and Sound Card that I'd unplugged aswell. I can't SEE any issues that'd probably stand out without taking the thing apart, something I straight up refuse to do because I have no idea what I'm doing and I'd no doubt just make it worse. I read the warranty on Asus's site about this card, it doesn't say anything about reselling to a third part as voiding the warranty, it says they'd ask for information like receipt, something I could probably get from the person I purchased it from, not sure if that'd be fine mind you but I don't really know, my Dad knows of a guy who fixes up computers and that so I could probably see if he'd be cool enough to check it out and see what's up, but I reckon doing so would void a warranty, IF one is still in place that is, if it is I could probably see if Asus will fix it for me, maybe. I just don't like the idea of having this powerful as fuck GPU being dead and there's nothing I can do about it besides cut my losses and move on, £720 losses no less, not something I'm content to just forget about at all, not with how little time I had with the card either.

I assume there is no image at all, even during startup? No BIOS splash screen for example? It seems like you've covered your bases and tried what you can. You could try to boot up with a live image of a linux distro or starting up the Windows installer from USB. But if there's no BIOS splash or any info at all related to that stuff then I don't think that'll work. If you have another PC to test then you could try putting the GPU in there. You were able to boot and use your PC like usual with the card installed while using the integrated GPU? Have you done that then checked the card from Windows? Does Windows detect it at all? If it does, then you could try using DDU to wipe the NVIDIA drivers and go from there. Check if it works without the drivers, try installing the drivers again, etc. Again, if there's no POST information during boot then I don't think this will work but it's worth giving a shot I suppose. You could try reflashing the GPU BIOS too. Though to be honest, it sounds like your GPU is having a bad time, especially if there's no display during POST.

I should note actually, one of the errors I got when I thought it was working again, as the display randomly decided to come back on before blue screening, the error DPC_WATCHDOG_VIOLATION, I don't know if this has anything to do with the GPU though or if it relates, but I don't recall ever seeing this bluescreen message before.

Remarks In general this stop code is caused by faulty driver code that under certain conditions, does not complete its work within the allotted time frame. https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/bug-check-0x133-dpc-watchdog-violation

From everything you've said it seems very, very unlikely that it'll return to life. Any number of things could have gone very wrong and there's not much you can do to fix them. But yes, I'd recommend trying to roll back and cleanly reinstall drivers just in case the software gods are conspiring against you.

I might have to look for a part repair shop, see if they can fix the card, could be possible to bring it back to life, right? I really don't like want to give up this easily.