Portege M800-106 - bad quality by using the external monitor

I use an external monitor LG Flatron L1811S on my Portege M800 and find that the image is not rock solid when I use the display on my desktop or screen of the M800.
It is particularly visible on the big patches of color block where I can see shimmering light. I noticed that it's especially bad if I recently reconnected the laptop to the network after using on battery power until the battery is fully charged.

This makes me think that the PSU interferes with the VGA output?
Any ideas?

Thank you

To be honest I m more important lack of information in your ad.
Are you using the native resolution - 1280 x 1024 / 75 Hz on screen?

Tags: Toshiba

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