Question My computer screen randomly shows TV static for 2 seconds then goes back to normal.

[BroncoBarry]

My computer screen randomly shows TV static (black/white dots) for 2 seconds then goes back to normal.

No new hardware, virus checks ok. Has happened four times like a virus

 

[rgd1101]

full system spec? include make and model of the psu

 

[BroncoBarry]

Gigabyte Z68XP-UD3
I7 4790
GPU AMD R9 270K
Windows 10 home 8GB ram

My system has not changed and previously had no errors.