Currently Being ModeratedOct 29, 2012 11:56 PM (in response to CrazyFreak)
The 350 MHz iMacs built between Oct. 1999 and July 2000 (model identifier PowerMac2,1) originally shipped with OS 8.6. These came in six colors: Blueberry, Grape, Strawberry, Tangerine, Lime, and Graphite. You need a full retail copy of OS 9 to install on this iMac.
The 350 MHz iMacs built between July 2000 and Feb. 2001 (model identifier PowerMac2,2) did ship with OS 9.0.4. These came five colors: Indigo, Ruby, Sage, Snow, and Graphite. You'd need an OS 9 original disk for these machines or a full retail copy of OS 9 to install on it.
Apple made hardware specific original OS install disks for each model of iMac that shipped. If you put these original disks in a machine that didn't have the correct hardware, they wouldn't work. So you may have a copy of OS 9 that was shipped with a different version of the iMac you have.
You can check eBay for retail copies of OS 9.
All that being said, it might just be the PRAM battery.