Help! High Pitched Noise From Monitor (Acer xf270hua)

[Silverseas]

Reddit failed me so here I am. 

This has me stumped. My Acer xf270hua makes a constant, very high pitched noise when I turn on my pc and doesn't go away, but if I turn the monitor off and on again it goes away instantly. Sometimes it comes back after my monitor being on for 12 hours, but once  again turning it off and on fixes it. I don't think it's coil whine. My main Acer monitor will be referred to as monitor 1 and my second 1080p Asus monitor is monitor 2.
 

Now for why I find it pretty weird. First of all, when I turn off monitor 1 nothing changes on my second display, but when I turn it back on monitor 2 quickly turns off and on, and all my windows appear on monitor 1 as though Windows very temporarily set monitor 1 as my main and only display. As far as I know, simply turning off the screen doesn't mess with display properties in windows?
 

Second, this has only appeared recently after I changed the refresh rate of my monitors. I recently realised that because I'm running two 144hz monitors my graphics card never downlocked, which I was able to fix by running both my displays in windows at 120hz instead. I started to notice the really high pitched noise so I changed my main monitor back to 144hz which made the noise go away, so I figured I'd fixed it. However, it comes back every time I turn on my PC. My cards are both now running at 120hz since this allows my graphics card to run as low as 139MHz instead of a constant 1500MHz or so at idle.
 

I'm just wondering if anyone has any idea what it could be causing this issue or how to fix it. It's not the end of the world since I can turn off and on my monitor every time I turn on my PC, but it's clearly indicative of something wrong and I'd rather not blow a capacitor or something, I really know nothing about monitors.

For system specs I have the acer xf270hua as my main display, asus vg248qe as my second display. Both connected to a 1080ti. I'm on Windows 10. Please does anyone know if this could be anything software related? It only started happening the moment I changed my monitor refresh rate so I'm still hopeful I won't have to try to get it replaced. 

[Turtle Rig]

10 hours ago, Silverseas said:

Reddit failed me so here I am. 

 

Nice story.  This doesn't mean the monitor will do very soon, but there is a problem.  It can die in 1 day or in 3 years ,,, Do you have RMA on it ?

Edited September 26, 2019 by LogicalDrm

[Silverseas]

6 minutes ago, Turtle Rig said:

Nice story.  This doesn't mean the monitor will do very soon, but there is a problem.  It can die in 1 day or in 3 years ,,, Do you have RMA on it ?

I don't believe so. Bought it on Amazon in April so the return window has closed. I can check if there's any sort of warranty on the Acer website but I'd be surprised. 

[Turtle Rig]

18 minutes ago, Silverseas said:

I don't believe so. Bought it on Amazon in April so the return window has closed. I can check if there's any sort of warranty on the Acer website but I'd be surprised. 

Acer must have a warranty give them a shot.  I think its 3 years possibly.  Don't dance with the problem, cuz some people say fuk it and just deal with what it is, but then next thing you know POP , your monitor goes pooof and your out of warranty with Acer ya know.

[Silverseas]

7 minutes ago, Turtle Rig said:

Acer must have a warranty give them a shot.  I think its 3 years possibly.  Don't dance with the problem, cuz some people say fuk it and just deal with what it is, but then next thing you know POP , your monitor goes pooof and your out of warranty with Acer ya know.

Ok so I have a 2 year warranty on this thing. Makes me a lot more comfortable, but I think I'll see about getting it repaired ASAP regardless. Really wish I had  just done something dumb in software that could be fixed, I've never heard of changing settings messing up hardware. Either a huge coincidence, or  setting my 144hz monitor to 120hz broke something. 
Cheers anyways