If this is a desktop I'd slip in a cheap video card and retest.
Welp....even tho i thought these were gone theyre back
basically 4 months ago i had these pixels that looked like blank tv stations popping up on screen and would sometimes spread/disappear. normally shows up on like pictures or web browsers. Im running a pc with on board graphics
CPU: AMD athlon ii x2 220
graphics: amd hd 3000
Its not the screen at fault already tried it out. usually refreshing it would solve it momentarily