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Mac G3 BW Power Faillure

Message #1 - Posted 2005/01/08 - morenuf

Previously, 3Dim wrote:

A friend of my has an iMac G3 blue and white (transparent case). After several power failures in his house, the iMac is not starting up, there is even no light burning on the thing if you push the power button.
The iMac was not running during this failures, just plugged in to the power.

I think it's something with power supply unit of the iMac.

Is it hard to find out?
Is it hard to replace this part?
Is it even worthy to do this? (233 MHz - 32 Mb - 4Gb HD)

I am not familiar with Apple computers but have a broad experience with (Windows) desktops, sorry..:)

Any help will be appreciated.

This is an older iMac (I assume one of the teardrop shaped with CRT single piece units). I never owned one or ever used one, but here are some possible things to at least try (free at no cost).

Yes, it could be a hardware problem, but at least try these.

Try each one, one at a time.

1) make sure all power cords are correctly seated and Mac is getting power. Unplug power cords and reseat.
2) Hold down COMMAND (flower shaped key) CONTROL keys and press Power button.
3) Press and hold the power button for 5 seconds, release and then try pressing it again to turn it on.
4) press the reset button (I believe in the recessed area on the side right? where the USB & firewire connections are.
5) holding down COMMAND OPTION P & R keys on start up until you hear the chime at least twice. This will reset the PRAM (parameter ram which controls startup functions and time, key repeat settings etc).

On desktop Macs of later vintage there were also a battery on the motherboard for power for Parameter RAM, and a motherboard hardware reset called CUDA on older Macs and PMU on newer ones. Replacing the battery and pressing this switch (either one) might bring back a desktop which has your symptoms. I don't know where the equivalent spots buttons are on an older iMac. These items are located directly on the motherboard on desktop later Macs.

Hope this helps and gets the iMac started. Wish I knew more about the older iMac specifically to help you better.

G'Day
Morenuf

morenuf@nobodyhome.com.invalid

Message #2 - Posted 2005/01/08 - 3Dim

I used some of your tips and it worked.
Especially the reset did the trick.
He is spinning again. :)

Thanks.

"morenuf" <morenuf@nobodyhome.com.invalid> wrote in message news:morenuf-71F681.16151008012005@news-server-fe-01.columbus.rr.com...

Previously, 3Dim wrote:

A friend of my has an iMac G3 blue and white (transparent case). After several power failures in his house, the iMac is not starting up, there is even no light burning on the thing if you push the power
button.
The iMac was not running during this failures, just plugged in to the
power.

I think it's something with power supply unit of the iMac.

Is it hard to find out?
Is it hard to replace this part?
Is it even worthy to do this? (233 MHz - 32 Mb - 4Gb HD)

I am not familiar with Apple computers but have a broad experience with (Windows) desktops, sorry..:)

Any help will be appreciated.

This is an older iMac (I assume one of the teardrop shaped with CRT single piece units). I never owned one or ever used one, but here are
some possible things to at least try (free at no cost).

Yes, it could be a hardware problem, but at least try these.

Try each one, one at a time.

1) make sure all power cords are correctly seated and Mac is getting power. Unplug power cords and reseat.
2) Hold down COMMAND (flower shaped key) CONTROL keys and press Power
button.
3) Press and hold the power button for 5 seconds, release and then try
pressing it again to turn it on.
4) press the reset button (I believe in the recessed area on the side
right? where the USB & firewire connections are.
5) holding down COMMAND OPTION P & R keys on start up until you hear the
chime at least twice. This will reset the PRAM (parameter ram which controls startup functions and time, key repeat settings etc).

On desktop Macs of later vintage there were also a battery on the motherboard for power for Parameter RAM, and a motherboard hardware reset called CUDA on older Macs and PMU on newer ones. Replacing the battery and pressing this switch (either one) might bring back a desktop
which has your symptoms. I don't know where the equivalent spots buttons are on an older iMac. These items are located directly on the
motherboard on desktop later Macs.

Hope this helps and gets the iMac started. Wish I knew more about the
older iMac specifically to help you better.

G'Day
Morenuf
--
morenuf@nobodyhome.com.invalid

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