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

When I connect my Samsung SyncMaster SA300 to my laptop running Windows 7 64 bit, I get a weird behavior.

When the lid is closed, everything seems to work:

enter image description here

When the lid is open, there is a weird collision between the monitors. Only one monitor is identified, and it seems to be a "merge" of the two monitors.

enter image description here

I installed the latest drivers from Samsung's site and ran Windows update. What is causing this, and how to fix?

Update - now the screen is dark with a "check signal cable" box. The cable is connected, and nothing I do (reinstalling driver and playing with monitor's internal config didn't seem to fix it).

share|improve this question
up vote 1 down vote accepted

Clicking Windows-P and extending the desktop to the other monitor helped with the 'check signal cable'. I always forget to try this (even though it was right there in the Screen Resolution settings!).

share|improve this answer

Have you tried using your video card software to configure your view? usually ATI and Nvida have their own application that allows you configure your view and resolution etc... try using that instead of the windows version maybe that would correct this problem of yours.

share|improve this answer
Please see the answer I posted - the problem is solved now. – ripper234 Sep 29 '11 at 15:23

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.