New build - No GPU output until I restart PC

Gopher_By_Fende

Gopher_By_Fende

Gopher_By_Fende

Associate
Joined
6 Sep 2005
Posts
244
Hi all

I built a new system yesterday, which includes an ASRock B850M-Pro A WiFi mobo, Ryzen 7 7700 and Gigabyte Radeon RX 7700XT.

When turning on the PC, I get no output from the GPU (onboard video works). If I hit the reset button, GPU now outputs fine. If I turn off the PC, the same issue happens again next time I turn on, I have to hit reset after powering up before the GPU outputs.

I’ve checked everything looks to be seated correctly, all plugs firm, bios flashed, and latest drivers installed.

Has this happened to anyone else, and any suggestions on what else to try before I start assuming the GPU or mobo is faulty?

Thanks
 
tamzzy said:
check the bios to see whether it uses the igpu or the 7700xt to display
Click to expand...
Thanks I’ll check that when I’m home, but the onboard gpu seems to work from cold, and the 7700 only on a reset.
Tetras said:
What order do you turn the monitor on versus the PC?
Click to expand...
The monitor has been left on currently, it will usually come off standby when I turn the pc on, then announce there’s no signal coming from whichever port I’ve connected to (hdmi/display port) then go back to standby. Then when I reset it wakes up and displays fine
 
Checked bios and the only option I can see is for display priority which is set to external GPU. I did just update the bios again as I realised I hadn’t downloaded the latest, and the first boot after flashing it did work without resetting, however after powering down again it’s back to the same
 
So I managed to find a setting for disabling the iGPU buried in the BIOS, it was set to auto which means it should disable the iGPU if an external output is detected. Now when I start up from cold or restart the card is outputting fine so I think its solved.
Only thing I've noticed is it takes longer to start up from cold with the card than the iGPU on first boot (not much maybe 30 seconds more), so thinking maybe it was the card taking a while to start up from cold, by which time the mobo had decided there was external graphics and kicked in the iGPU, but that may be well off.

Either way, it *seems* to be resolved so thanks for the help and the suggestion to disable the internal graphics :)
 
I've done both and I think its a bit quicker now thanks :)

I don't think the initial issue is totall resolved yet, as I went for dinner and when I came back the PC had gone to sleep, and while it seemed to wake up when I moved the mouse (fans/RGBs turned back on) I got no video again until I restarted. I could work around this by just disabling hibernate, but would be good to determine if anything is faulty, so I'll have to keep investigating I think
 
Cheers I'll give it a try.
I'll reseat the RAM again, I did move it from slots A1/A2 to A2/B2 when I first booted after building, as it looked like I was getting a CPU/RAM error (However this may have been the GPU issue all along)
I did get the 650. It has 4 pcie/cpu ports, so theres currently 1 free, and the GPU uses 2 of them already. I'll move one across, if no change, ill move the other across and let you know
 
So this is what I've tried so far -

Reseated RAM into A1/A2 (Before I saw your above post, I was not aware of this so no eggs being sucked here, a lot has changed since my last PC build it seems lol, no more pairing up sticks it appears)
When I did that, the PC started power cycling when I tried to turn it on, and after moving the RAM back to A2/B2, it would not boot until I cleared CMOS.
Changed port on PSU, no change (I am using 2 cables, one to power each of the 8 pin sockets on the GPU)
Removed and reseated GPU again, no change.

Current BIOS changes are -
dGPU mode only enabled
Fast boot disabled
PCIe x16 Link Speed changed from auto to Gen4
DRAM Frequency changed from auto to 5600
Memory Context Restore enabled

This is the current behaviour -

When booting from off ->

CPU/RAM Dysfunction lights display, GPU fans and logo light come on
GPU fans go off (logo stays lit)
10-15 seconds later, CPU/RAM lights go off briefly, GPU fans come on then off again, and CPU/RAM lights come back on again
This usually happens once more with the same 10-15 delay, however I have seen at least once it cycle this behaviour 3 times
Finally CPU/RAM lights go off, the VGA light flashes briefly then it boots fine

If I then restart from this state, none of this happens. the CPU/RAM then VGA lights flash briefly, GPU kicks in, PC boots fine.

If I power down and restart from off again, the delays start again.

I did try a stress test on the GPU using Furmark and it seems to run fine, with a score above the average for a 7700

The CPU/RAM lights staying on would make me think they are the issue, however when the iGPU is enabled, then it starts straight away, but only with the iGPU outputting video

I've had some confusing PC issues over the years but this one is up there
 
thanks, I’ll review the BIOs settings mentioned when I’m home. I have just checked the QVL list for the mobo, and I cant see KF556C40BBK2-64 listed but KF556C40BBAK2-64 is, which to my naive eyes looks to be the same stick but just with RGB?
 
I was just changing the frequency, again showing my total lack of knowledge of current BIOS configs lol. I've changed it back to auto now, the option to enable/disable MCR disappears when the frequency is set to auto so not sure if that means its still enabled or not. EDIT: Found the MCR setting eventually, disabled it and no change in behaviour when starting up

I haven't touched any EXPO settings myself yet, the DRAM profile is currently set to auto, which I think it using the JEDEC profile (4800, 40-39-39), but XMP1, 2 and 3 options are available, with XMP1 being the advertised 5600 40-40-40. I have tried setting it to XMP1, again no change.

I just checked the behvaviour when hibernating again, and it still shows no video when waking up from hibernate, however in this instance there are not BIOS lights up (The cpu fan/LEDs come back on however as does the keyboard)
 
Last edited:
Just put the 1070Ti from my current machine into it, and it doesn’t have this delayed startup. As the 1070 only uses one 8 pin cable I tried it with both and it started up perfectly both times.

Not sure if that means bad GPU, or some config/compatibility issue, but it’s at least something
 
Last edited:
Checked some PSU calculators to make sure 650w is enough for this system, and it seems ok, but also disconnected all hard drives except the m2 and no change. Raised a ticket with OcUK as I can only assume faulty GPU at this point
 
You must log in or register to reply here.
Back
Top Bottom