iMac Power Issue???

[MacDaddy]

I have a slotted 350 mhtz iMac (2000) with power issues.
I've changed the logic board... nothing. I've changed logic board/power supply combination... nothing. I've changed the power cord... still nothing. I'm very frustrated at this point in time.
I'm not sure where to go from here. I have a iMac 450 mhtz DV+. Should I open that one up and start testing supplies or logicboards?
I know it's not the harddrive because I believe that the computer would still start up.
Any suggestions before I open up the other iMac???

[Buzz]

have you checked the battery and the power cable?

[MacDaddy]

I sure did.... I didn't have a new battery on hand, but I did replace the battery with another one. I also replaced the power cord and I tried plugging the cord into a different outlet.

When I press in the cord into the computer, should you hear some kind of electrical connection? Nothing is really happening when I do that.

I'm reading a lot about analog boards... Macs are so easy to figure out, I don't know why this one is giving me so many issues to get it back up.

[mac4me2]

Did you try pressing that little button (cdum?) on your board?

[MacDaddy]

Yes i did do that as well.

[MacDaddy]

I joined this board for help and I'm a bit disappointed on the response.

Again... I have a dead iMac. All I need to know is what is my course of
action from here.

I've changed power cords, keyboards, mice, PRAM battery, reset the
PMU button, changed logic boards, changed power supplies and I
still don't have any start up.

All I need to know is... where do I go from here? Is there something else
I can look into? Is it worth sinking anymore money than what I have so
far? I purchased two logic boards and one power supply.

[Buzz]

A bit disappointed? What are you expecting exactly? All the information we have is that the Mac doesn't power up. The fact that it won't power up would lead anyone to believe it's the power supply, the battery, the power cable, the on/off switch, or the actual outlet your plugging it into. I don't know how you expect others to diagnose a problem that is not directly in front of them. How is anyone to know that you've installed the power supply properly, swapped logic boards with the proper replacement, connected everything properly and not mistakenly replace faulty parts with other faulty parts? My next course of action would be to contact your closest authorized Apple repair center. After all this is just a message board not a repair center.

[MacDaddy]

Thanks for the tongue-lashing Scott.

If you re-read all of my posts, I believe you would have gotten a good taste of what I was doing. Disappointed yes... I've asked a question in my very first post if I should try swapping parts with my running iMac 450 DV+ to test parts and nobody seemed to answer that fairly easy question.

I may not be a tech nerd, but do know enough to have changed things and nothing. If you can't see my frustration, then I apologize.

All I needed to know what my next logical recourse. Someone suggested a flyback transformer. Could that be a possibility?

Thanks

[Buzz]

Chances are swapping logic boards from a 450mhz iMac to a 350mhz iMac may work other parts may not due to the larger processor. In fact the larger processor on the logic board may mean that swapping power supplies could b very bad for the 350 logic baord.

I can't comment on the flyback transformer.

Try the forums at macfixit.com you may get more users there that are IT specialists and have done more hardware troubleshooting.

[MacDaddy]

Thank you Scott...

I really appreciate the effort and advice.
Again, please accept my apology for my rudeness.

I did purchase a working 350 mhz logic board with a power supply
and there's still nothing happening... and to be honest, I just am
finding a hard time letting this iMac go for good.

Tony

[Buzz]

From the sound of things I'd be just as lost. Seems to me if logic board, power supply, battery, switch, and cable are all in working order it should power up. No hard drive would result in a boot and a sound to indicate no hard drive.. bad RAM would result in a boot and a sound to indicate no RAM.