Mac Mini hangs on "Starting Mac OS X" Screen

Last night updates appeared and of course i said yes to install them. Before the reboot, update OS X 10.4.7 falied and it said it was moved to the trash. Once it tried to boot up, it stay on the screen, "Starting MAC OS X". I was able to get the music CD to eject by holding down the Left Mouse button. I tried to boot from the Tiger CD but can't. I have tried booting from the Panther CD but can't. I tried to start in Safe Mode but it won't. After the chime i held down "C" but nothing hapens, it just goes to "Starting MAC OS X" it does same if I try holding the Shift key. Please any help would be great. Thank you.
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dripaAsked:
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BoffgroupCommented:
then you should re-install the os

choose the option that says archive and install, and then select the option that says "Preserve existing Users & Network Settings" so that you minimise disruption
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strungCommented:
Try zapping the PRAM by booting while holding down the command-option-p-r key combination until the computer chimes three times.
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BoffgroupCommented:
sounds to me like your keyboard isn't plugged in
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dripaAuthor Commented:
No. The keyboard is plugged in but apparently you have to have a genuine mac keyboard if you want to boot off from a DVD-ROM. Apparently a MAc compatible logitech keyboard deactivates the Shift + C + Command + and options keys
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BoffgroupCommented:
is it a wireless keyboard?
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dripaAuthor Commented:
It was a USB Logitech keyboard that was suppose to be Mac compatible. I went out and bought a mac keyboard and was able to boot from the Tiger DVD. I did the repair disk and permissions but it didn;t help. It still just sits at "Starting Mac OS". Then I tried logging in as Single User Mode and mount the HD and deleted cahces file, still stuck
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walsellersCommented:
My Mac Mini never did like booting with the old monitor attached.  It would sit with the spinner forever.

Once this happened, I just disconnected the monitor for a moment, then re-connected it. It worked fine.

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