Help, please -- can't boot, won't boot.

My iMac (800Mhz G4 flat panel) has suddenly refused to boot. There is life of a sort -- I get the 'grey apple' screen and nothing more. The DVD tray will not open from the keyboard (there was no disk in place at the time).
By using firmware, I can get into Start Manager, which correctly displays the OSX HDD as a startup volume (it does not offer OS9, which may not be installed for startup -- I don't know). I cannot, however, open the HDD volume -- if I attempt to continue, the sytem just freezes and I have to shut down again.
Again using firmware, I have been able to open the DVD tray and put in the OS X installation disk to attempt a disk startup. If I attempt to boot from the disk directly (holding down C while switching on) the result is exactly as before -- the grey apple screen only -- though disk sounds can be heard. After a few minutes, the machine simply shuts itself down again.
I have tried again using Start Manager (holding down Options while switching on). Start Manager opens and displays both the original OSX HDD volume and the installation disk. Hooray! thinks I. But no . . . if I now select the installation disk and continue, the system gets as far as the installation language panel but will not allow me to select the language -- it again just freezes. It remains frozen until I switch off. I can go no further.
Any advice at all would be warmly welcome, please.
iMac G4 17" flat panel Mac OS X (10.4.6) 800Mhz 1Gb RAM
iMac G4 17" flat panel Mac OS X (10.4.6)

Two options to try:
Hold down shift during start-up. This enters your Mac to Safe Mode. You should then remove any Log-in items (System Preferences) and any Fonts you've installed recently from your Library folder.
Try following the instructions in this article (on the basis that you have a misc start-up issue).
HTH
mrtotes

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