External LCD Monitor Flickers for 10 - 15 minutes before it settles down

I have a Lenovo 3000 N100 with a samsung syncmaster 931B as the second monitor. When I activate the monitor, it flickers for around 20 minutes before it settles down. I have the resolution set at 1280x1024 32-bit color 60hertz refresh rate.
I've had this monitor for more than one year, without any problems. I've recently updated the nVidia Ge Force 7300 video drivers on my Windows XP Pro SP2 system.
Actually, the problem is not the monitor. I can connect this monitor to a second laptop and it works fine, with no flicker.
I have PC-Doctor 5 installed and the video tests for the nVidia GeForce 7300 and the external monitor itself ran with no problems.

I have a similar issue: external Samsung monitor worked fine on Vista, but I could not stand Vista. I put Win Xp Pro on... and I cannot get any signal out through the VGA port now. The monitor works fine (still), tested with two other latptops.
My suspicion is that the nVidia driver files, possibly the .INF, may need tweaking / replacement / etc.
Any assistance appreciated.

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