No signal to monitor on startup

Superlevure

Superlevure

Superlevure

Associate
Joined
9 Jun 2015
Posts
142
Hi guys,

Just built a new system, works well under load but there are a few glitches.
Half of the time, when I start the system, there is no signal to the monitor.

a) The fans are running in the system, I can hear the system starting but there's nothing going out of the gpu.
b) I thought maybe the video was coming out of the motherboard integrated graphic chipset so I plugged the hdmi into the motherboard instead: nothing happened.
c) when I turn off the pc and switch off the psu and reboot: it works
d) could it be that the gpu is poorly powered? I've used the y cable, but apparently the evga G2 650w in single rail, so it's supposed to make no difference. I'll still try that at some point.
e) the gpu is from my previous build and I've had it for 15 months, it's always been fine.
f) the motherboard is a Asus z170 pro gamer, with lots of LEDs flashing around when turned off - could it draw power and mess the system at boot?

Here's my system: i7 6700k, evga G2 650w modular, MSI 970 gtx, Asus z170 pro gamer

Thanks for reading
 
Last edited:
You could try disabling the iGFX in the bios just to make sure its not sending the signal to that.
 
BluD said:
You could try disabling the iGFX in the bios just to make sure its not sending the signal to that.
Click to expand...

Thanks

I disabled the iGFX, and it didn't help, unfortunately. I tried disabling the LEDs, it didn't help either.

My computer literally only works one time of two. I turn it on, no video. Ido a hard reboot, and the video works fine. It feels ridiculous!

Next thing I'll try is to power the gpu with another cable, maybe two different ones. (that gpu used to be powered by a 10 year old seasonic s12 600w, it doesn't make sense!)
 
Superlevure said:
d) could it be that the gpu is poorly powered? I've used the y cable, but apparently the evga G2 650w in single rail, so it's supposed to make no difference. I'll still try that at some point.
Click to expand...

This made me think of the 0 RPM default fan profile on those cards. If something is funky somewhere, one bit might be telling another that since the fans aren't running then the card is off and doesn't need any power at all, or something quirky like that. But maybe you've already tried setting a custom fan profile.

Have you tried the GPU in the other PCI-E slot on the board?
 
Danny75 said:
This made me think of the 0 RPM default fan profile on those cards. If something is funky somewhere, one bit might be telling another that since the fans aren't running then the card is off and doesn't need any power at all, or something quirky like that. But maybe you've already tried setting a custom fan profile.

Have you tried the GPU in the other PCI-E slot on the board?
Click to expand...

It's definitely something I must try. But the 970 doesn't always run the fan, does it? When idle, on the windows desk, I always thought the fans were still.

I haven't tried anything with the GPU yet.
 
Superlevure said:
It's definitely something I must try. But the 970 doesn't always run the fan, does it? When idle, on the windows desk, I always thought the fans were still.
Click to expand...

Precisely what I was getting at, i.e. try setting a custom fan profile that will have the cards spinning all the time, even if at a low RPM where you can't hear them. Never at 0 RPM. Just a shot in the dark among other things. Can use Afterburner for this.
 
This is going to sound odd but it could be something simpler then you think. One of my monitors takes a while to switch on, and the pc can usually start up pretty fast, it switching res from bios to windows will halt the monitor progress to start up as well. But on restart it is already almost there and will appear right away. We are talking a matter of a couple of seconds here though, so might not be that as I assume you left it a decent amount of time first...
 
I've got the same motherboard and you can turn the LED's off in the BIOS.

I'll check my GTX 980ti to see if the fans are spinning when doing a cold boot.
 
labcoattech said:
I've got the same motherboard and you can turn the LED's off in the BIOS.

I'll check my GTX 980ti to see if the fans are spinning when doing a cold boot.
Click to expand...

I tried turning the LEDs off, but it didn't change anything for the boot.

Earlier today I removed an external drive, one of the memory modules and one extra hard drive. It didn't help.

Next option:
a) remove the other memory module
b) change the pci-e slot of the 970 gpu
c) change the cables
d) reinstall windows (I think the whole thing might have started after an update of AI Suite 3 went wrong, it wouldn't uninstall, etc. it was a big mess)
 
5960xNvidiaGamer said:
Did you sort this out? I have had no issues on the latest Nvidia driver, is that what is causing it for you? Sounds like an overclock issue to me tbh.
Click to expand...

I've just installed the 364.51 drivers and I'll see how it works out. The thing is: it happens on cold boot, when the pc has been off for some time. So I have to wait before being able to check.
 
Changing the NVidia drivers didn't change anything.

Before a cold boot, I tried two other things:
a) changing the slot of the GPU
b) removing each memory module, leaving just one in

Following both attempts, the pc started properly on a cold boot. But the day after the problem had come back. As if the bios had acknowledged the change in the rig, tuned itself in some kind of 'safe/compatibility mode' and booted properly. The day after, on a normal boot, it fails again and needs a reset to start.

What a mess.
 
I had the same problem, basically the same kit. Solution for me:

Loosen the CPU cooler screws slightly, see if it boots fine - does the Q Code readout display get stuck at a certain number? My issue stemmed from that, not sure what cooler you are using but my CPU back plate was on a little tight. The reason it changes when its a cold boot I assume is due to things expanding when hot and contracting cold - no idea if the Asus boards have a pressure sensor but I tested this thoroughly and it was defo the issue with mine.

Sounds strange but over time its now fine screwed down tight, next time try loosening each of the 4 screws on the front a few turns and trying again... If you are using an aftermarket CPU cooler that is, with a 6700k you probably are. I don't think its a GPU driver issue, at the point of it booting to BIOS its not really loading the full Nvidia package so you should see it post. If that works loosen off the back plate screws slightly so the screws are not sticking out the threads (laying flush with it) and tighten down the front fully (testing post as you go).
 
You must log in or register to reply here.
Back
Top Bottom