Hi all, I've got a dual G4 MDD. I upgraded the RAM to 2 GB with 4 512MB DIMMs. That worked fine for a long time. Last Monday the power went out at my home. It took be a week to get the machine working properly again. What finally worked was removing 3 DIMMs and leaving one in the '0' slot. Today I tried reloading all the DIMMs to see what would happen. I discovered that if I had a DIMM in slot 1, the Mac would not boot. Out of curiosity, I tried one of the old 256MB DIMMs in slot 1. That worked. Odd. The slot works with a 256, but not 512 DIMM. Yes, I tried all the 512 DIMMs in slot 1, that stops the Mac from booting. Anyways, my computer is working fine now. -Thom -------------- next part -------------- An HTML attachment was scrubbed... URL: http://listserver.themacintoshguy.com/pipermail/homemac/attachments/20060127/8be1b13c/attachment-0001.html