- Jul 7, 2008
- 5,558
- 25
- 91
Edit: it was my crummy PSU. Replaced it with a nicer one and my PC is working beautifully again.
Edit 2: Well, after installing a new PSU, the PC lasted for maybe a day before losing the video signal again. Now looking for another fix.
Original post:
I booted up my PC this morning - same as I always have for the past several months that I've had it - and only after a couple minutes of use, my monitors suddenly started flickering once or twice before completely turning off. The PC itself still appeared to be running.
Puzzled, I switched my computer off (can't remember if I had to hard-switch it off or if I was able to do a soft shutdown, sorry) and I turned it back on again, hoping maybe it was just a fluke. Still no video signal. Grabbed a flashlight and took a closer look at the GTX 980 inside my computer. One of the fans wasn't spinning. The other fan appeared to be working, but the fan speed was oddly fluctuating up and down. Weird. So maybe something was wrong with the GPU.
I opened the case, dusted everything out, re-seated the GPU, and also reset the CMOS for good measure. Turned it back on and still no video.
The 980 is definitely toast, right? I set aside the GTX 980, clear the CMOS one more time, and try turning on the PC again, this time using the integrated graphics on the motherboard. Nope... still the exact same behavior, even with integrated graphics.
So regardless of whether I use a dedicated GPU, or the integrated GPU, I get no video signal. There must be a deeper problem somewhere. I started slowly unplugging different things both inside and outside the case - any unnecessary USB peripherals, USB connectors, audio connectors... I even unplugged all of my SATA drives.
I tried booting the computer back up multiple times during this process (clearing the CMOS almost every time). So far there's been one occasion when I did manage to get a BIOS setup screen very briefly before the monitor turned back off again. Didn't really give me any time to actually do anything.
So maybe there's an electrical short somewhere in my computer, some kind of foreign object or debris that's causing the problem? But it's so strange that it would just randomly happen to my PC in the middle of use. Regardless, I took apart almost my entire PC (bar the CPU cooler) used my electric duster to clean everything off, and carefully-reassembled everything. Pressed the power switch and... still no video.
I don't know what to do. At this point I think it might be a motherboard problem, but I don't know for sure. My CPU (an i7-4790k) was overclocked to 4.6Ghz at 1.20v, which I know is the outer-limit of OC for that particular chip, but it's always been completely stable and rarely goes into the 70's temperature wise, unless playing demanding video games. Everything else in the system was running at stock.
Any advice on what to do next would be appreciated. Thanks in advance.
Specs:
i7-4790k @ 4.6Ghz
MSI Z97-G45 mobo
Corsair Vengeance 16GB DDR3 1600Mhz RAM
MSI GTX 980 GAMING 4G video card
Samsung 840 EVO 120GB SSD
WD Black 4TB HD
Corsair CX750M PSU
Corsair H80i cooler
Edit 2: Well, after installing a new PSU, the PC lasted for maybe a day before losing the video signal again. Now looking for another fix.
Original post:
I booted up my PC this morning - same as I always have for the past several months that I've had it - and only after a couple minutes of use, my monitors suddenly started flickering once or twice before completely turning off. The PC itself still appeared to be running.
Puzzled, I switched my computer off (can't remember if I had to hard-switch it off or if I was able to do a soft shutdown, sorry) and I turned it back on again, hoping maybe it was just a fluke. Still no video signal. Grabbed a flashlight and took a closer look at the GTX 980 inside my computer. One of the fans wasn't spinning. The other fan appeared to be working, but the fan speed was oddly fluctuating up and down. Weird. So maybe something was wrong with the GPU.
I opened the case, dusted everything out, re-seated the GPU, and also reset the CMOS for good measure. Turned it back on and still no video.
The 980 is definitely toast, right? I set aside the GTX 980, clear the CMOS one more time, and try turning on the PC again, this time using the integrated graphics on the motherboard. Nope... still the exact same behavior, even with integrated graphics.
So regardless of whether I use a dedicated GPU, or the integrated GPU, I get no video signal. There must be a deeper problem somewhere. I started slowly unplugging different things both inside and outside the case - any unnecessary USB peripherals, USB connectors, audio connectors... I even unplugged all of my SATA drives.
I tried booting the computer back up multiple times during this process (clearing the CMOS almost every time). So far there's been one occasion when I did manage to get a BIOS setup screen very briefly before the monitor turned back off again. Didn't really give me any time to actually do anything.
So maybe there's an electrical short somewhere in my computer, some kind of foreign object or debris that's causing the problem? But it's so strange that it would just randomly happen to my PC in the middle of use. Regardless, I took apart almost my entire PC (bar the CPU cooler) used my electric duster to clean everything off, and carefully-reassembled everything. Pressed the power switch and... still no video.
I don't know what to do. At this point I think it might be a motherboard problem, but I don't know for sure. My CPU (an i7-4790k) was overclocked to 4.6Ghz at 1.20v, which I know is the outer-limit of OC for that particular chip, but it's always been completely stable and rarely goes into the 70's temperature wise, unless playing demanding video games. Everything else in the system was running at stock.
Any advice on what to do next would be appreciated. Thanks in advance.
Specs:
i7-4790k @ 4.6Ghz
MSI Z97-G45 mobo
Corsair Vengeance 16GB DDR3 1600Mhz RAM
MSI GTX 980 GAMING 4G video card
Samsung 840 EVO 120GB SSD
WD Black 4TB HD
Corsair CX750M PSU
Corsair H80i cooler
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