Is my logic board dead?  I can't see a hard drive

My G4 Powerbook (FW800, 1.25GHz model) stopped booting last week, and showed the question mark folder. I ran disk utility from the Tiger CD, and it doesn't "see" the drive. Same with system profiler. Under ATA it shows my Matshita CD-RW, but no hard disk.
Figuring the hard disk is dead, I replace it with a Hitachi 5K160.
The result is the same - neither disk utility nor system profiler can "see" the drive. I also tried target disk mode, and the firewire host couldn't see it either.
This leads me to suspect the logic board, perhaps specifically the ATA controller. However, this doesn't quite make sense, since if the ATA controlled was dead why would the CD-RW drive work?
There are no jumpers in the new drive (just like the old one), which makes it a master.
thoughts?
thanks.
G4 PowerBook   Mac OS X (10.4.8)  

i've seen dead drives - clicking, buzzing and not accessible that passed all tests including fsck command.
often tests won't find errors.
if 2 different dirves are not recognized by Disk Utility it's either drives, drive cable (rare but possible) or logic board.
another way to test drives is to put them into FireWire external case (probably can get one for $20) and try to format them that way.
if drives work and boot the machine, it's likely either drive cable or logic board problem.

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