I just bought a samsung 245BW as an external monitor for my Acer Aspire 5100.
When I connected the monitor a lot of flickering was visible. After a couple of different setups(including another laptop - sony vaio) I saw that the flickering was caused only when the laptops where plugged in. If the laptop is on battery power no flicker is visible.
I also plugged the monitor into another wall plug and the flicker is acceptable now.
I was wondering what are my solutions: - get some sort of filter device - get another monitor - something else
PS: all the drivers are up to date
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Try using a ground-lift connector on the power plugs for the monitor/laptops.
Sounds like a problem with the monitor. I would get a different brand.