MB screen flashes on and off...HELP!

Just got a new macbook for my wife. Came from Apple with 2 sticks of 256mb RAM. I added 2 1gb Patriot sticks from Newegg. all seemed well. but now under load, not full load just opening apps, the screen flashes black and then after a few seconds it comes back on. It happens often enough to be annoying.
Here's what I did:
1. Replaced with apple shipped ram.- Doesn't seem to occur, so I figured bad ram...
2. Ran memtest on both stick individually. 3 passes on each stick
3. Reset PMU as advised by AppleCare
Still could be bad ram but...
1. I pulled the two 1gb APPLE RAM sticks from my 17" MBP, still occured.
2. Tried the Patriot 1gb sticks in my MPB, all is fine.
So I don't think it is bad ram?
Any helpers out there? Apple wants to blame 3rd party RAM, but their ram that shipped with my MBP exhibit's the problem too...

My screen was flashing just like yours and failed tonight, 20 days into the purchase. Take it back and get a refund. Don't take another macbook until they get all of these quality control issues worked out. This was my third macbook and I had not been having any problems, but was experiencing the flash. It is starting up in the background and can be used in target disk mode, so the issue is the screen. Return while you can, it will eventually go out completely.

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MB screen flashes on and off...HELP!

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