Hi,
I'm having this issue with a new monitor that I've got - the PIXIO PX275H - it is a 1440p monitor with an advertised refresh rate of 95hz.
The monitor works fine when it is set to 60hz but when you adjust the refresh rate in windows to the max advertised speed I get flickering. This essentially is where the whole screen goes black and then comes back on again, it doesn't do it at 60hz but anything above that and the issues start. I am using a brand new display port cable and I have updated my GPU drivers (HD7970) and all windows updates are done.
Also, when I'm in a game it doesn't seem to flicker when set at the maximum resolution (2560x1440p) but if I want to run a game in 1080p it doesn't like it at all and starts to flicker again.
Interestingly in the device manager it is showing "Generic PnP Monitor", not the make/model number under the monitors section. I've looked into this and tried a few 'fixes' but none seem to work for me.
This is also a recently built PC - with the exception of the GPU as I've reused the one from my previous build as I wanted to wait until the new AMD/NVIDIA cards come out this year before I decide which to buy.
Any help would be appreciated, I'm not sure what else to do and I'm considering sending the monitor back - that said, I'm not sure whether it is my monitor, GPU or the display port cable.