I have an MDD 1.0 DP that is experiencing lockups among other things. Here are some of the issues. 1. Anything connected to the ATA-33 bus is not detected. This includes Superdrive and hard drives. I can connect the Superdrive to the ATA-66 and it works fine. Tried different cables and such. The ATA-33 Bus does not even show up in System profiler. 2. The system locks up a different times within OS9 and OSX. Sometimes on boot up . Sometimes after using it for a while. 3. Attached is crash on screen. Other times it gets the dreaded put button to restart your mac screen. Things that I have tried. 1. Reset nvram, reset pmu, zapped pram. removed battery. 2. Swapped memory with working MDD 1.25 DP. 3. Currently just using a 512 Memory stick. 4. No add on cards 5. Used mutiple hard drives even swapped with working MDD 1.25 system 6. Can't run AHT since can't boot from Superdrive. 7. Removed heatsink and reapplied thermal compound. Anyone have a clue what could be the issue? I am guessing it is the logic board.