External monitor goes black when macbook pro has magsafe connected

Hi,
I have bought an external monitor about 1 week ago, and I have it connected with a minidisplay to dvi cable, and a dvi cable to the monitor.
It was working OK -well, it had some sudden flash to black screen that lasted about 1 second, but nothing else- until thir morning when it just started showing a black screen. Mac OS sees the monitor, and I can move windows over there, etc. It's "alive". But I only see a black screen on the monitor.
I tested with other computer, and it works OK. The cables work too.
What I discovered is that if I unplug the power adaptor from the MBP the monitor screen shows correctly.
It works OK only if the magsafe adaptor is unplugged from the MBP, it doesn't care if the magsafe adaptor is plugged to the power or not; only if it's connected to the mac book pro.
It seems like some magnet stuff is making a mess there. What could it be? I can't work on the monitor only in battery power...
I tried resetting nvram and the other stuffs that I found here, but nothing works.
Thanks!
Javyer

Hi javyer!
Here is an article that explains the troubleshooting for this issue in more detail:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Thanks for being a part of the Apple Support Communities!
Cheers,
Braden

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