MacBook Freeze with lines on screen

I have a 2.1 CTO with 120 GB HD, 1 GB RAM and 256 video RAM. I have experienced three computer freezes with an associated screen display that has diagonal lines as shown in this image:
<http://homepage.mac.com/strait/Sites/Macbook/pages/MacBook%20Freeze%20Screen.h tm>
The lines have active pixels that turn on and off during the freeze, making the lines appear to be slightly animated, or "sparkly." The computer must be restarted with the power button after the freeze.
The freeze has happened once a day and is not associated with any specific activity. The first time it happened was right after receiving the unit before I added any software. No programs were open.
The second time occurred while using Front Row and viewing a DVD, and after adding software (MS Office and Adobe CS programs).
After this, I ran the Hardware Test (short and extended) and there were no problems discovered. I then Erased and zeroed the disk and reinstalled the OS and all the Apple software, plus my software. I then added an additional 1GB of Crucial RAM.
The third time occurred with no programs open. I reran the hardware test and again had no problems. I then removed the extra RAM, but the first two incidents occurred with only Apple installed memory.
I have had the computer for three days and have had three freezes.
Any thoughts on this?
Dave
G5 2.5 GHz Quad, 6.5 GB RAM, NVIDA 7800 GT Mac OS X (10.4.5) MacBook Pro 2.1 GHz

Well ive had this once or twice and the only time it has ever happened has been first time just after logging in and the other couple of times when waking up from being asleep.
Exactly the same screen as the first poster.
I do hope this is just a bug in a dodgy driver or something that will be fixed with a software update or some firmware update, i really do not want to part with my nice new MacBook and faff about with support calls because:
a. ive just got it setup the way i want, and
b. it works fine 99.999999% of the time
Oh and ive rebuilt the whole system from scratch, but that was for a different problem with .Mac not syncing correctly.
Ste

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Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1333 MHz, 0x80CE, 0x4D34373142353737334448302D4348392020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xD6), Broadcom BCM43xx 1.0 (5.106.198.19.22)
Bluetooth: Version 4.0.8f17, 2 service, 18 devices, 1 incoming serial ports
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USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfa100000 / 3
USB Device: BRCM2070 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 5
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x821a, 0xfa113000 / 8
USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0252, 0xfa120000 / 4
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USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfd100000 / 2
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd110000 / 3
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