Nvidia GeForce 9400M makes my MacBook Pro screen blinks

I am using a Macbook Pro 2.4MHz Intel Core 2 Duo, 4GB 1067MHz DDR3.
That's the one with the Nvidia GeForce 9400M and the Nvidia GeForce 9600M GT.
Using the Nvidia GeForce 9400M, as my default video card, seems to make my screen blinks. That is random.
Apple's Hardware Test show no problems.
When I am using the Nvidia GeForce 9600M GT the screen blinks stops.
I am sure that all started after updating to Mac OS X Snow Leopard. I am currently running Mac OS X 10.6.5.
Is this a software problem or there is a problem with the Nvidia GeForce 9400M chip?
Does any is experiencing the same problem?
+the problem withe the screen blinking is quite old. I am mostly using my Nvidia GeForce 9600M GT as my default video card with no problem at all, but I want to be able to use my Nvidia GeForce 9400M because of the better battery life.
Any help will be valuable.+
Tom.

I have the same issue with mine and sadly I missed the date to get Applecare on this machine (they usually call but this time around they didn't).  ***** that I didn't get this resolved before my warranty ran out .. I'm certainly not going to shell out for a replacement motherboard out of pocket.  I now use the 9600 graphics exclusively and can almost watch my battery drop by the minute.
On a side note I'm not very impressed with the quality control Apple has had with their portables in the last few years.  I bought this unit refurbished and it took two units to get one that worked properly, and even then this one never did as it's had this video blinking issue since day one.  The problem is I didn't really notice it until recently when I started using it running more often on battery and decided to use the mobile chipset to save battery time.  This is the third MBP I've had and their 3rd MBP that's had motherboard issues.
When it comes time to replace this one I'm seriously considering going with a macbook air or something else.  Can't justify spending the money on more MBP's with such terrible track records.

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