Maybe this has already been suggested, but swap the two memory chips. I was able find to a faulty memory chip this way on my TiBook a while back. Small Dog made the exchange, no questions asked. On 3/7/05 11:23 AM, "Kynan Shook" <kshook at cae.wisc.edu> either wrote, forwarded or quoted: > Pull the RAM, run DiskWarrior, and try your computer for a week or so. > If you see a lot of errors with DiskWarrior, there's a good chance your > memory is bad. Other culprits can include the processor or cache, but > those don't happen nearly as often on PowerBooks as, say, the PowerMac > G5, because those components aren't as bleeding-edge. > Anyway, AHT passing your memory means jack squat - partly because a > software test can't really do a good job, and partly because it seems > like you might have a heat-related issue where the memory is fine until > it gets to a certain temperature, or other intermittent conditions are > satisfied. -- JEL