gfx card is not recognised... sometimes. Help needed.

Stiffler05 · 26 Mar 2015 at 22:42

Hi,

I've been struggling with this problem for a while now and its really bugging me. Basically about 1/3 of the time i start my pc the gfx card isn't recognised. Its a hd7950 in an asrock z77e-itx. When it does recognise the gfx card the pc runs fine and theres no issues with intense gaming etc. However when i shut it down and turn the pc on the next day the gfx card sometimes isn't recognised (nothing in device manager, can't install amd drivers etc). Literally nothing has changed or been moved overnight and yet the card is for some reason not being recognised. If this happens in the morning the card won't work for the rest of that day no matter how many restarts i try or how much tinkering i attempt. It will be another 24-48 hours before it'll randomly start working again.

Sorry for the long post, but has anyone had experience with something like this or got any ideas? I'm at a loss.

Stiffler05 · 26 Mar 2015 at 23:15

I've updated the bios to the most recent version whilst trying to sort this out. No change unfortunately. I've got 8GB of ram. The gfx card works perfectly in another pc, i've tried it myself. And i also tried a known working gfx card in my pc while the issue was occurring and that made no difference.

Stiffler05 · 26 Mar 2015 at 23:34

I think i have. Like i said, how can the gfx card not be recognised at one time, then 24 hours later work perfectly? Absolutely nothing has been changed, no software, no hardware, the pc hasn't been moved an inch... all thats changed is power on or power off.

Stiffler05 · 26 Mar 2015 at 23:55

wazza300 said:
Try two clicks more vtt

It will be at stock 1.05v in bios

I'll give that a try, thanks. Does it go up in increments of .01 or .05 normally?

Stiffler05 · 27 Mar 2015 at 08:55

wazza300 said:
I'm not sure but try with 1.06v to 1.07v and see if that helps with the cold startups and GPU detection

Tried with a few vtt voltage settings this morning. Unfortunately no change. Gfx card is still not recognised. Any other ideas?

Stiffler05 · 27 Mar 2015 at 09:05

Karateyid said:
Any mates able to lend you a card to test with?? Or pass your card to them?? Could be the card could be the connection on your motherboard.

I've tested the gpu already. It works fine in another pc. And I tried a known working gpu in my pc when the issue was occurring and that didn't work.

Stiffler05 · 27 Mar 2015 at 10:11

implosiveturnip said:
How old and what brand/model is your PSU? Possibly power supply on it's way out?

Its a pc power and cooling silencer mk 3, 600W. The pc was a bitfenix prodigy system build from overclockers about 3 years ago.

I did wonder if it might be the psu, but if that was the case wouldn't it buckle under heavy load when the gfx card is actually recognised? Returning the cpu or gfx card to stock makes no difference in the recognition process. I tried that as a first resort.

Stiffler05 · 27 Mar 2015 at 13:31

I'll try 1.1V and around on the vtt and see what happens.

If it was the cmos battery that had gone flat surely it would never boot up after a long period of inactivity because the charge would have gone? Wouldn't it also affect bios settings? If the cmos battery was at fault wouldn't keeping the pc on for a while generate a small retained charge and so subsequent reboots would recognise the gpu? Because that hasn't been the case.

Stiffler05 · 28 Mar 2015 at 14:03

XfXGamer2014 said:
Did you manage to sort this out mate?

It's going through a working period at the moment. The vtt is at 1.07V so maybe that has helped. I won't be holding my breath though cause it's done this a few times. I'll be back here if it stops working again. For the mean time, thanks for all the help guys.

Stiffler05 · 31 May 2015 at 21:43

So the issue has cropped up again after almost 2 months of pretty reliable use. Turned the pc off one night and the gfx card hasn't been recognised for the past 3 days. Only thing thats been different the last couple of months is that the signal cuts out during use every so often. Always for about 1 second but frequency and situation is totally random, during gaming, while browsing etc. I really don't understand why it works (relatively) fine one day and then the next the gfx card isn't even recognised. Any help would be really appreciated.

Stiffler05 · 1 Jun 2015 at 23:00

Deathjester said:
Is anything overclocked in your system?

If it works in another machine, it could be worth testing another power supply, it's possible that if it's not supplying enough power on boot then it wont detect the card after that.

I normally have both my cpu and gpu overclocked. However i've tried dropping everything back to stock on numerous occasions and it doesn't make a difference.
Todays events (cpu overclocked, gpu not, as per the last few days), 3 start ups in the morning, no gfx card recognised. Went to the gym and when i got back thought i'd try for the heck of it... and it worked. Its so random.