Okay. I just bought a pristine used 1ghz Tibook. Cosmetically pristine. Superdrive had failed, okay, I knew that beforehand. Then I pop in more ram to the the thing and the CPU speed on the "about this mac" under 10.3.9 reads 667mhz??!!!!!!!!!!!!!! I know the logic board was replaced in the first year of warranty on this machine so I make some bitchy calls to the certified apple repair place and inquire as to how they could have put on a 667 board on a 1ghz machine. Call Apple who tells me that they did indeed ship out a new logic board to this company at athat time. 1ghz board. Then I notice that it IS actually a 1ghz board because it is stamped so on the memory bar atop the board. The serial number is also a 1ghz, though there is no serial number onscreen under the "about this mac" spec window. WHAT is going on? Could a superdrive failure be affecting the logic board's CPU. AND THEN, the original Fujistu hd fails, forcing me to boot up from an external hd via firewire. What, what, what is going on? Can a failing logic board register at lesser CPU factor than it is built for? Does the failed superdrive/and now hard drive have anything to do with the lesser CPU rate? I'm stumped. My first impulse is to get it to an Apple tech and have a new cd drive and hd put in to see if this is the remedy, but the fact the thing is working at a depressed CPU speed is very very very weird. Any thoughts, anyone?