EDIT: So I just cleared the CMOS and now something strange is happening. I still get the no signal message on my monitor but my PC seems to repeatedly turn it self off and on every 3 minutes. I can tell because the lights and fans stop spinning for a few seconds and suddenly starts spinning again. (I did not have my graphics card plugged in the entire time, now I'm 100% certain something else is wrong with my PC, not my graphics card)
EDIT2: I found a random comment on reddit saying that his PC kept bootlooping because of a shorted front usb port on his case. I thought no way it's actually my case's fault. Was totally prepared to buy a new mobo/cpu. I unplugged the blue 20pin plug from my case to my motherboard and lo and behold it immediately boots up!!
Now I'm wondering how did those random artifacts appear on my monitor and shut down my pc in the first place. Surely my case couldn't have caused that?? Would it be smart to conclude that both my case front ports dead and my GPU is slowly dying?
I just want to make sure, because I bought most of my parts from Amazon so if any other parts are defective, returning them is quite easy before the 30day return widow passes. I'm happy to keep using my case and leaving the 20pin unplugged since I barely use my front ports, and I'll just bite the bullet and upgrade my GPU.
Basically I'm running a triple monitor setup when suddenly my left monitor started having artifacts as shown in the image above. My middle and right monitor didn't have any artifacts. I WAS NOT GAMING at the time, just normal web browsing.
Then 10 seconds later, my PC completely shuts down and I can't reboot, all my monitors says no display input found. I see lights and fans spinning on my PC but I can't get any signal on my monitor.
I unplugged my graphics card and plug in my monitors to my motherboard CPU's integrated graphics card. Everything boots fine and I get a display, I plug back in my graphics card and boot again, and my BIOS says it's in recovery mode and rebooted my PC back to normal. Now everything seems to be working fine again.
10 days later the SAME thing happens again, the exact same artifacts on my left monitor, I do the exact same process as above, but this time I don't even get any display signal from my motherboard CPU's integrated graphics card. This really confuses me.
If my graphics card is unplugged and I still can't get any display signal, would that mean my PSU or something else is defective? My entire PC is brand new parts except for my graphics card. I am running an i7 13700k, Z690M motherboard, 850w SFX PSU, 128gb ram, used GTX 1080 from my previous PC.
Have you removed the card and physically reseated it?