G4 iMac 800mhz (OS X 10.2.8) won't boot

Hi,
My old G4 iMac running OS X 10.2.8 is having problems booting up. When you turn it on it boots to the grey screen and gets stuck there. What can I do? The only thing I know which I'm about to try is boot in 'safe mode' by holding down the shift key. Is there any thing else I can try?
Thanks

HI Reelsick Productions!
What size is the Hard Drive, and how much space is available?
How much RAM is installed, and is it original or added?
What peripherals do you have connected? A keyboard, mouse, printer, external drive or modem, router, etc?
What happened between the last time the iMac started successfully, and when it didn't?
Have you made any changes, like upgrading the system, updated or installed any applications or programs, etc?
Have there been any unusual occurences, like freezes, crashes, power outages, etc?
Are you able to startup from the system install disc to run Disk Repair?
Is the iMac shutdown overnight, or does it run 24/7?
Have you ever run any routine Maintenance procedures?
ali b

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Memory Slots
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