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Displayport causing monitor to flick on and off as well as prevent bootup

Harmeh

Harmeh

Harmeh

Associate
Joined
31 Oct 2012
Posts
6
I just put together a new coffeelake rig with a single 1080ti (https://www.overclockers.co.uk/asus...dr5x-pci-express-graphics-card-gx-410-as.html) with the aim of running at 1440p at 150Hz with Gsync (https://www.overclockers.co.uk/asus...descreen-led-monitor-black-red-mo-088-as.html)

When first setting up the system I noticed that the monitor would flicker on and off before going through the bios splash then booting windows. I didn't think too much of it until it got worse, so bad in fact that pressing the power button on the tower now just makes the monitor endlessly cycle on and off without booting at all.

I tried connecting the monitor up to the graphics card using HDMI and that works fine, though of course I can only get 60Hz and no Gsync so that is hardly acceptable. Connecting the monitor to the mainboard displayport also works fine so I am fairly sure that the cable and monitor are ok.

Any suggestions before I RMA the card would be greatly appreciated!
 
Out of curiosity why are you using 150hz ? Maximum standard refresh is 144mhz and anything above is gained by the inbuilt overclocking of the monitor refresh rate which then gives a maximum of 165mhz. So question is does it work fine at 144mhz and 165mhz via the 1080ti DP connection ? 150mhz is a strange one to chose too as the scaling goes a bit rubbish on mine at the res I would have never thought to use it.

Also when you connected it to your motherboard did you check 150hz was selected in Nvidia Control panel ?
 
I had a similar issue. It was the cheap displayport cable i had bought. It was passing voltage down from the screen to the motherboard. I’d definitely try a new cable first, but make sure its a decent one.
On a standard Displayport cable being used to hook up monitor to video card.
Pin 20 DP_PWR Power should not be connected. It is back feeding 3.3v back into the video card causing all kinds of issues. A lot of companys are pushing out products that are not following the correct VESA Displayport Standards.
 
Thanks both for your replies.

As for the 150hz I did wonder at that but it was the default when it was in overclocked mode so I left it as is - Nvida control panel did report it as 150hz and everything looked fine. Switching overclock mode off did not resolve the issue. I also cannot make any changes to the refresh rate for DP using the Nvida control panel when connected via hdmi as that option is not available and connecting via DP to the onboard graphics makes the whole of Nvida control panel unavailable.

I just tried removal then re-installation of the drivers to see if I could get it to default to a lower refresh rate but no dice.

I will acquire a new cable and see what happens.
 
I picked up a replacement cable from Maplin as I was passing and I am now able to boot when connected via DP!

Only able to manage 85hz but better than the HDMI plus I can use Gsync. I have a Accell UltraAV B142C-007B on order and will update again if that lets me get to 144 or 165. Thanks again for the advice :)
 
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