Greetings all, I'm looking at an iMac (Ruby, I believe, slot-loading model, 400mhz w/Firewire, �1999) for a friend of mine who had difficulty with power on. I've reset the logic board, replaced the PRAM battery w/ a new one; what I get when pressing the Power-on button (on the Mac w/ no keyboard, but same results with keyboard) is: green light on button, indicator LEDs on logic board flash, and speakers attempt to sound out the start-up chime, but don't make it, then all goes dead. What's next? Fuse? Power/Analog/Video board? I've verified that the logic board is getting trickle-down power as the service-source manual indicates.
Any help from iMac know-ers would be most helpful.
Just a WAG here, but I'd bet a dollar to a donut that "somebody" tried to load and boot from OSX before doing the required firm-ware upgrade (don't ask me how I know).
Do not attempt more restarts from that HDD, as this may make the situation worse.
I have solved a similar problem by replacing the HDD with one that has MacOS 9 loaded, doing the FW Upgrade, and then loading MacOS X. No worries thereafter.
You _may_ be able to start up from a MacOS 9 start-up disk and then erase all vestiges of MacOS X from the original HDD & loading OS 9 drivers on the HDD, but that is speculation on my part.
For access to a large store of info on this pitfall in dealing with certain iMacs, do a Google on the relevant terms, such as "iMac", "firm ware", "upgrade", etc.
Good luck.
Jack
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