M675XL Video Card Problem Again? HELP!!

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I wrote in last week about the fuzzy blue screen and my video card. Before I packed up my computer and shipped it away, I did a system restore to the week before the problem started and it seemed to fix it...

Fast forward a couple of days-

Every other day or so the computer is reverting to the fuzzy blue screen and lines of nothingness. It is all black other than during the windows splash screen; once in a while there are white fuzzy lines all across the black screen.

To fix it, I have figured out that if I plug an external monitor into the back vga port and toggle between lcd/crt on the laptop, the picture eventually comes back to normal on the laptop. I can then unplug the external monitor and go about my business.

Any ideas what the problem is? It is driving me crazy and I hate to send it in to Gateway and pay so much without knowing definitively what the problem is. Plus, if I send it in and it is in it's "normal" state, who knows what they'll do to it.

Thanks in advance for any and all responses.