Combo Drive quit after replacing PMU/Battery board

Hi-
My Pismo (firewire, 400mhz) has a combo drive which barely worked, but worked up until
I had to replace the PMU/Battery logic board. Now it won't recognize a cd or dvd, period.
Up to now, it made a lot of noise but it would load a cd and eventually play it. I wonder if I have to
re-install software for this, or if maybe it was just time for it to finally die. (I reset the PRAM
and the PMU; I tried Disk Permissions; it's listed but no fixes are made available (all the options are in light grey and cannot be selected). I have the 10.3.9 install disk, and a system restore disk;
they don't play.. however i have not tried to reboot from them.
If I do try booting from a system restore or system install disk, will I lose any and all stuff I have now (music, etc).. or will it just update and repair the system?
thanks in advance
sr
ps in my system profiler I see the combo drive is listed twice. It wasn't before.

Here's how I revived my Pismo's failed disc drive. http://macosx.com/forums/howto-faqs/290895-how-resurrect-failed-laptop-disc-driv e.html
 Cheers, Tom

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I'm not clear on some things:
"Rebooting from OSX disk hangs with a circle slash.
Same if I try to reboot with Diskwarrior CD or TTPro.
Removing the hard drive has the same result.
Correct. I cannot boot from ANY bootable CD except AHT, not even with the internal drive completely disconnected.
Booting from an external firewire utility drive is
successful, however I'm unable to successfully
reformat the hard drive. Disk Utility sees the drive,
and begins to reformat, but hangs at about 10%, and
it instantly shows more than 10 partitions but none
of them successfully are created. Drive Genius just
fails to initialize.
I tried a different hard drive, same result.
Apple Hardware Test and TTpro all show that hardware
is OK."
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Combo Drive quit after replacing PMU/Battery board

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