G4 Mini - Can't see CD or internal harddrive, but FireWire is fine

G'day - if someone has had this problem sovle before, I would appreciate just being pointed to the topic. Otherwise, here's my problem and what I've tried so far. Thanks for any help.
I'm guessing its a hardware issue - but since my machine's out of warranty if somebody could help me pin point it, I could decide what to do better.
The Problem:
Every now and again my computer will freeze upon waking from sleep. Sometimes it will be fine until I click on an item on the dock. It seems that it crashes when it needs to access the harddrive.
Upon restarting I get the flashing finder/question mark icon.
If I bung in my Tiger CD-ROM and restart holding 'C' the computer returns to the flashing icon.
If I hold option on startup, neither the hard drive or the cd-rom show up to boot from. If I've powered up my FireWire Backup drive I can see my cloned volume.
The CD is now stuck in there until the problem fixes itself. I can't eject the cd with the mouse button or through open firmware.
Things I've tried:
I've booted from my FireWire. The CD and HD do not appear on the desktop and are not listed in Disk Utilty or the Choose Startup Disk dialog.
I've also tried resetting the PMU and PRAM. No dice, I think. Sometimes a few reboots after resetting the PMU the problem fixes itself - but this is probably a coincedence.
Mysteriously the problem is fixed:
Sometimes a couple reboots after a PMU reset while I'm trying to eject the cd with the mouse button - suddenly the cd will eject and the computer boot normally.
The proximity of this to the PMU reset could just be chance, I suppose, since I'm actively fixing it.
It could be something else. Or it could be fixing itself randomly.
Any help is very much appreciated as I'm finding it hard to my honours with this problem
Mac Mini G4 1.42 512mb Mac OS X (10.4.5)

I have the same problem, no solution as of yet, i will try resetting the PMU and see what happens.
http://discussions.apple.com/thread.jspa?threadID=608574&tstart=15

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