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Apr 17, 2012 1:39 AM in response to John61254by Kenichi Watanabe,★HelpfulThis is the PMU (power management) reset procedure for the iMac G4.
http://support.apple.com/kb/HT1712
If you have been connecting the power cord to an old (or overcrowded) power strip, try connecting it directly to a wall outlet by itself. Also, during the initial power up attempt, only connect the power cord (keep all peripherals disconnected).
If you've never replaced the PRAM battery on that iMac, it is probably getting weak or dead. That can cause startup issues. The procedure to replace the PRAM battery can be found here (select your particular iMac G4 model)
http://www.ifixit.com/Device/iMac_G4
The PRAM battery looks like this
http://eshop.macsales.com/item/Newer%20Technology/BAA36VPRAM/