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

I have a Lenovo T400 laptop, with Windows XP. I have a docking station connected via DVI to my Samnsung monitor. I'm connected at 1920x1200 resolution and I keep seeing all these green dots (when colors are supposed to be near black). It's really bad. I have tried running on my Samsung monitor, at all sizes, even down town 1280x1024 like my monitors at work.

When I use the docking station at work, I am able to connect 2 1280x1024 NEC monitors (one via DVI, one through VGA, both through my docking station). I have absolutely no issue there, both displays work great.

I have tried to update the drivers, I've even installed the latest video drivers from lenovo's site (DEC-02-2010).

Is anyone familiar with this issue?

Details: Docking Station: Lenovo Advanced Mini Dock- 250410U - NIB
Montior at home: Samsung T240 24-inch monitor Monitors at work: NEC monitors

share|improve this question

It's possible that it might be your Samsung T240 that has the problem- not your docking station. If your Samsung screen shows green artifacts when connected to other computers, the screen probably has dead pixels. Get a new screen if this is the case (or maybe, get the screen RMA'd).

share|improve this answer
I have it on a 4way KVM switch, it works on the other 4. Turns out was a bad cable on the KVM switch – Roy Rico Jan 20 '11 at 19:08
up vote 0 down vote accepted

Turns out was a bad cable on the KVM switch. I just replaced it and it worked.

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.