Black screen with white square in top left bug Windows 10 please help

[sebbymwe]

Randomly (but mostly when browsing in Microsoft Edge)I get a black screen with a white square in the top left and it dosent seem to be doing anything bad and it stays there for a few seconds but it is really annoying. Please help me.

Thanks in advance.

 

[Colif]

is the entire screen black with a white square in corner or is it opening a command prompt with a white square in it? trying to picture what you are seeing

I take it you aren't using a Mac?

doubt its this: https://forums.geforce.com/default/topic/975163/black-box-in-top-left-corner-of-my-screen/

try running an anti virus scan or malware scan

 

[OdinXcore]

Just had this happen to me, scared me to death.

I had a black window appear, with a white square, on top of everything else, lasted for roughly 3-5 seconds, beeped a bunch of times and disappeared.

I was launching League of Legends at the time, and I haven't been going to any sketchy sites, neither have I installed any new software.
if it happens again, I will report back.