Imac freezes during startup stops @ blue screen & have tried everything

My imac freezes during startup, it gets to blue screen and just sits. I have tried to boot from the Leopard 10.5 install disk, and just sits, can't get to log in screen. Have run the disk utility and it says disk appears to be ok, Won't startup up in safe boot, blue screen just sit. Have tried 'fsck' fix, just sits at blue screen. Have reset PRAM, I don't know want else to try. Disk utility & "fsck" says 'disk appears to be ok'. When exiting fsck, it will start the process then stops. Does anyone have any suggestions, I have not tried to reinstall 10.5 yet.
Thanks in advance
Paula

After reading resolutions TS1541 & other threads, I decided to try to archive & reinstall 10.5 from install disc. Well that made things worse, sometime during reinstall, system locked up, I looked at the log during install & it had been locked up about 3 hours and now I have nothing. no systems files, using Target( firewire cable) disc with my macbook, I can see I have previous system folder & a folder that say system. but Install disc does not see OS.
Do I need to take it to an apple store for repair or what. It's only 3 years old.
please help
Paula

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Imac freezes during startup stops @ blue screen & have tried everything

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