I went from padded (stellcase please V2) to mesh (Okamura Contessa) to mesh (Herman miller aeron) back to padded because at home I like to change my pose and place my legs up on a chair and let me tell one thing about padded Vs mesh - mesh works for one pose and one pose only while padded works...
Had similar simptoms (intermittent black screen) with sub-par hdmi cable (it was certified) so my first suggestion would be to change to another certified hdmi cable.
Another possibility could be bad GPU (also had that happen to me when GPU was not making full contact with water block), but...
Was running 13600k and 4090 (both slightly overclocked + 3x NVME, 3x hard drives and custom loop) with tx850m. The only reason I upgraded to rm1000x was to lower my noise as max power usage at wall was around ~620 W (so around 550 W by all components before PSU efficiency loses). Not a single...
Just
You know what solved all of my problems? Sidegrading (as there's nothing "better" as far as I can see) to C1. Same pc and none of the problems I previously experienced.
At least EDID edit with previous version of CRU (CRU was updated recently) resulted in no signal received by LG C9 (as far as I'm aware it was the same for everybody else with 6000 series GPU, 120/60Hz, 4k, 1440p or 1080p made no difference) as display was detected by windows (LG just displayed...
So glad I sold my c9 few days ago (no support from lg/amd for Vrr on c9) . Just before I bought heavily discounted 48cx today 48c1 showed up for pretty much the same price (immediately bought it). Here's me hoping actual c1 (and not CX) model shows up so I can be sure to receive firmware updates...
I just wanted to chime in – here, in Eastern Europe, cheapest (cards with better cooling cost even more) in stock 3080 goes for 3074 USD. Cheapest 3070 goes 1628 USD. Those prices are definitely dropping in a different direction than their supposed to. 3090 cards are not even in stock...
Like I said – I had the same flashing (which started abruptly after 8 months) issue with 1080 ti, AMD rx 6800 and now with nvidia 3070 so I highly doubt its video card issue (but I cant reject x570 causing this as I honestly do not remember if I had same flashing with intel; did flashing start...
As a fellow owner of C9 which was used as monitor since day 1 I may be able to give you my experience as I think it may be display itself (or AMD x570 platform + c9 but it is very doubtful) that is causing your problems (mine started after around 8 months of use). Never saw anything like that...
Just to rub it in – nvidia doesnt have either #2 or #3. Vrr just works and at 4k 120hz I get few watts higher power draw than at 4k 60hz but it's unnoticeable (memory idles in low power state).
I second #2 (just unplug all fans with exception of cpu fan) as quite recently had realization that my gentle typhoon fans resonated at around ~700-850 RPM. There's not that many moving parts in a PC so elimination is best bet. And just to be sure – you fastened the screws firmly? Loose panels...