A stuck pixel is a bright dot of colour that fails to update when neighbouring pixels change.

Stuck pixels are most noticeable when the rest of the screen is black.

JScreenFix can repair most stuck pixels in less than 10 minutes.

If a spot on your screen doesn't change when it's supposed to; if it's stuck on blue when it should be red, give this a try.  It's just a site that will try to unstick it.

IF, however, that spot is black, it might not work.  That might be a dead pixel, not a stuck one but, just in case, give this a shot anyway.  Really, it can't hurt.