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May 1, 2016 8:51 PM in response to JonathanG16by Carolyn Samit,That iMac was originally sold about 1998 so it's no surprise it won't turn on.
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May 1, 2016 10:29 PM in response to JonathanG16by Jeff,The slot-loading 400 MHz G3 iMac is a 1999 model, but after many hours of use, those iMacs were prone to failure of the P-A-V (Power-Analog-Video) Board. There was no cooling fan in that model and convection cooling just wasn't adequate to protect certain components from heat-related damage. Unfortunately, there are no replacement PAV boards still being manufactured today. Even if you found a used part at ebay, the likelihood of getting long service life from it is doubtful, given the fact that the parts are old (17 years). Of greater concern is the fact that replacement of it involves exposure to potentially lethal levels of stored current, if not discharged properly before proceeding with the repair. It requires someone who's experienced with working on CRT-type TVs and displays.