Waves/Flickering whilst gaming & browsing on GTX 970

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rightmexx

Nov 8, 2018
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Hello,



I really need your help here, i just bought a second hand PC. The problem is that the monitor is flickering during browsing and gaming. I see (almost transparent) waves going up and down on a loop on the display.

My monitor has only vga output and on my gtx 970 card i have hdmi and dvi input.





Things that i ve tried from other forums with same issue and didn’t work:



- changed the vga/ dvi adaptor and cable

- changed the dvi adaptor to an hdmi adaptor( on a vga cable)

- used another monitor (also with vga output)

- used both monitors on a dell 7577 laptop with vga/hdmi adaptor and had no flickering at all !

- used an hdmi to hdmi cable to screen from my Gtx 970 to my projector and didn’t flicker !

- also tried the hdmi input from motherboard and didn’t flicker



I am so confused, I don’t have the money to buy another monitor at the moment.

Do you thing my gpu is dying ?



SH pc specs:



Msi Z170A krait gaming 3x motherboard

I5 6600k

Gtx 970 OC



Monitor LCD asus it s pretty old at least 4-5 years.

Sorry for bad english...

Thank you !!

 
Solution
A_Goat
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rightmexx

Nov 8, 2018
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Exactly ! I even went and bought a new thick VGA - DVI cable and still flickered, it was was less noticeable then on VGI-HDMI to be honest.
 
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A_Goat

A_Goat

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Nov 30, 2014
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Sounds like electrical interference, this is supported by your troubleshooting step of using HDMI to HDMI (digital signal) with no flickering.
VGA is analog and as such can be affected by polluted (poorly grounded for example) electrical current.

You can try using a different outlet on a different circuit in your home, or trying to separate/combine the monitor/computer onto the same/different circuit in your home.


 
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rightmexx

Nov 8, 2018
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I have two hdmi ports on my PC, one is the Intel video card and the other is the nVdia video card.
When the monitor is connected to Intel, i have no flickering at all, but i can't play games.
When it s connected to my nvidia GPU port it's flickering.

I tried switching outlets, plugs and everything.. still same result.

 
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A_Goat

A_Goat

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In your original post you said that you used HDMI from your 970, as well as integrated, with no flickering.
The 970 requires drastically more power than your integrated graphics, which would explain why integrated doesn't display the interference (also it being a digital connection).

It's possible that the polluted current comes out of every outlet in your home which is entirely possible, especially in old homes and shared buildings. Regardless though, it sounds exactly like interference which would mean the only reasonable solution would be for you to utilize a digital connection on a newer monitor. You've already proved the solution with your troubleshooting steps.


 
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rightmexx

Nov 8, 2018
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Thank you so much for taking the time to explain this issue.
Just bought an Acer monitor with hdmi input and it doesn't flicker anymore !!! It took me 3 days to resolve this issue but I am so happy now !
If possible, can you tell me why on my dell 7577 the exact same monitor( the old one vga) doesn't flicker ? Is it because laptops aren't that sensitive regarding electric interference?
 
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panathas

panathas

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Feb 12, 2014
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Your Desktop PC system is probably producing too much EMI (Electromagnetic Interference) which obviously affects all the analog signals which are more sensitive than the digital ones. There are many causes for this, the electrical installation of your home, a bad ground, bad or problematic PSU, a PC case with bad EMI shielding, a mistake during the motherboard installation inside the PC case, etc.

Also keep in mind that if you do have too much EMI, you may also experience this in the sound output of your motherboard with too much noise or static coming from your headphones or your speakers. This is also an analog output. However you won't experience this if you are using USB speakers/headphones or the HDMI output for sound which are all digital. Good luck.
 
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rightmexx

Nov 8, 2018
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I do have a Dragonfly USB for speakers, I'm pretty sure that if i change sound output i will get static/noise, too afraid to try it at this point.
And yes, we have very very bad electricity in this area, blackouts as often as 5 times per week.
Thank you for the help, my PC is all good now. woohoo !
 
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A_Goat

A_Goat

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The laptop (specifically the GPU) is using much less power than your desktop, the increased power draw allows for increased interference to travel from the wall through your computer to the monitor.
 
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