MacBook Freeze with lines on screen
<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