Not exactly flicker, but I have one monitor that makes an audible whining noise when certain spreadsheets are open and the window is sized above a certain % of the screen space.

It's maddening, but IT won't swap it out for me.

I say certain spreadsheet, but really it's something about the formatting and contents of a single page in that sheet. Open in Excel, noise. Snipping tool snip of the screen, also noise. That page printed to PDF and opened, however, does not make noise.