Imac G5 tiger will not start up, PLEASE HELP

i have an imac G5 powerPC running tiger. when i turn it on it does the normal noise, then goes through the normal stuff, but when the load up or start up bar comes on, it will load slowly inch by inch when normally it would load almost instantly. it will then get to the end and just stay there...
what is wrong with this? how can i fix it? please help, thanks!

HI,
*"thank you for your reply. however this did not work."*
Do you mean you couldn't run Disk Utility from your install disk?
*"if i re-install tiger will my documents and music and stuff be lost? will that solve my problem?"*
No one can guarantee it will solve the problem but instead of an erase and install which would erase all your documents and music, try an archive and install instead. For information go here.
About the Archive & Install Feature
You should also make a back up of important files before any Mac OS X installation, whether erase or archive just in case.
*"i tried to install the latest security update and when it was downloading it, it was almost done when a message came up and said that it could not be installed at this time"*
Check your available disk space also. Right or control click the MacintoshHD icon on your Desktop, then click: Get Info. In the Get Info window, click the discovery triangle so it's facing down. You will see; Capacity and Available Make sure you have 10% available disk space, 15% is better. Not enough available drive space can cause issues like you are experiencing.
Carolyn

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