Suddenly my entire screen now has little dots on it that flash back and forth between pink and blue. What's up?

I was online (on Facebook) when suddenly my coputer screen developed these little dots--uniform across it not just in a browser window--and they started flashing back and forth between blue and pink. The computer froze up and I had to reboot. It hasn't gone away and it's terribly annoying. What should I try to do?

It may be a problem with your video electronics - possibly heat related. Shutdown the PB & leave it overnight. Then startup & see if the dots appear.
 Cheers, Tom

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Suddenly my entire screen now has little dots on it that flash back and forth between pink and blue. What's up?

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