Leopard won't go past the grey apple and the paddle wheel.

*Problem with start up on Leopard 10.5*
This Imac only goes to the grey screen with the apple logo and the spinning paddle wheel and no further. What can I do?
Last night the screen froze over and I couldn’t force quit, so I switched off. Was only running safari, after installing some graphics upgrade from Apple.
Today I’ve tried switching on with :=
1. D. Hardware diagnostics. No problems found.
2. Shift - Start in Safe mode. No effect. Grey apple and paddle wheel.
3. Command + S. Provides a text screen which end with
CSRHIDTransitionDriver: start booting in single user … will wait for window Server
and nothing happens however long it's left
3a. Command + V. Verbose mode? as above but, after the reference to firewire Lucent the CSRHIDTransitionDriver has 4 lines:
CSRHIDTransitionDriver::start [-v]
CSRHIDTransitionDriver::switchToHCIMode legacy
USBF 2.517 CSRHIDTransitionDriver etc etc
CSRHIDTransitionDriver ... done
4. C to start from CD. Repaired disk and disk permissions.
5. Command Option P R. Reset the PRAM
6. Shift. Safe boot again. No effect again. Grey apple and paddle wheel.
7. Command Option O F to open firmware. Well, it didn’t work. Nothing happened and I did not reset nvram.
8. Tried to restart from 10.4 cd but this didn’t help.
9. Command + S. Again. Provides a text screen which end with CSRHIDTransitionDriver: start booting in single user … will wait for window Server
Any suggestion how to cure this will be greatly appreciated.
Or, how to set about reinstalling Leopard while preserving as much data as poss.

Are you calling Single User Mode what I understand to be Single User Mode?
What happens if you restart the machine holding the command (Apple logo, cloverleaf) key together with the S key? Do you get a command line? If you do, you should be able to use
http://docs.info.apple.com/article.html?artnum=306857
If you don't get a command line, are you using an Apple wired keyboard to hit the shortcut? Non-Apple keyboards and wireless keyboards may not be able to activate the keyboard sequence.
If you are getting the command line without results, the spacing fo the command is critical. I will show you with the underscore as in: _ where to put the space:
/sbin/fsck_-fy
/sbin/mount-uw/
rm-rf/System/Library/SystemConfiguration/ApplicationEnhancer.bundle
It is important you observe the upper/lowercase spellings above.

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                   8%          WindowServer
                   3%          EtreCheck
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              172 MB             Google Chrome
              102 MB             Mail
              97 MB              Google Chrome Helper
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              974 MB             Inactive RAM
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