Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

My external monitor appears like in image on random time, I have to power off the monitor and on again to get working. It is making me crazy.

enter image description here

I am using:

  • Macbook pro 2012 model
  • external monitor (SAMSUNG SyncMaster P2250) using DVI cable with mini display port.
share|improve this question
When did it start? Does it happen when certain things occur? Have you tried a different cable? How old is the monitor? – Taegost Jul 31 '13 at 17:19
Have you tried just reconnecting the cable? It occured sometimes with my Macbook too. – Igor Hatarist Aug 1 '13 at 4:29
I am getting this for 6 months approx, and it just occur randomly. I had tried with different cable, but happening same. Monitor is nearly 2 years old. Yes I had tried with reconnecting cable, it works for few time only. – Pravat -Mujah Maskey Aug 1 '13 at 4:29
up vote 0 down vote accepted

I have not exact answer for my own question, but my problem got solved , may you guys have better explanation,

I was using monitor with powered by UPS, and when I moved this monitor to my friends home, problem is not happening again.

seems, is there problem with electricity source ?

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.