iMac G4 won't boot up.

[appledyl]

I have a fifteen inch 800 MHZ 768 MB ram iMac G4 and for some reason it won't boot up. The apple screen shows up, goes away and then the screen is apple-blue with the cursor you can move around. I left it on overnight and it didn't get past the apple-blue screen. What do I do?

 

[John Doe 57]

http://support.apple.com/kb/TS1411