Combo / Optical Drive detected but not reading CD & DVD

Hi everyone,
Firstly, I apologize if this topic has been covered but I've searched up and down and couldn't find it.
I'm running the following computer:
G4 MDD Dual 1.42Ghz, 1Gb RAM, OS 10.4
My computer has been dormant for about a month now and last night I fired it up with the following problem: _Grey screen with spinning 'loading' icon and it wouldn't get into the desktop_
I managed to successfully boot to the desktop after I did a combination of the following:
1. Reboot in Safe Mode (Shift)
2. Reset NVRAM (Opt + Cmd + O + F)
3. Reset PRAM (Opt + Cmd + P + R)
4. Removed all 3rd party cables
I haven't used the Combo/Optical Drive for about a month now and I decided that maybe I should re-install Tiger. When I inserted the Installer CD, the Combo Drive (1st slot) just ignored it. Initially, Superdrive (2nd slot) also ignores all discs I inserted. After countless restarts, I managed to get the Superdrive to read the G4 Hardware Test CD.
I've done the following:
1. Finder preference is set to not ignore inserted media
2. Tinkered with the Optical drive by unplugging and plugging it back
3. Everything else I could find on the internet regarding troubleshooting it
4. Made sure that the cables are connected properly inside the computer
5. Ran the Apple Hardware Test CD and everything is OK.
6. Checked with the System Profiler and it detects both Optical Drives (1st slot = Combo Drive, 2nd slot = Superdrive).
Now the problem is:
1. Combo Drive does not read any inserted disc (CD & DVD)
2. Superdrive reads but spits them out soon after
3. I can't re-install Tiger
Any advice / suggestions is very much appreciated.

Hi David,
My computer has been dormant for about a month
Have you checked the PRAM Battery, they can cause strange things & last 4+5 years...
http://eshop.macsales.com/item/Newer%20Technology/BAA36VPRAM/
Combo Drive does not read any inserted disc (CD & DVD)
Opticals do go out, but 2 at once doesn't seem likely. What happens if you open Disk Utility then insert a Disc?
Have you tried a Cleaner CD in them?

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