where can I buy a power module for the imac G5?

Do a web search for "Mac parts" and you should find a number of sources. Which will be reliable I can't say. Perhaps someone else here will have a recommentdation.

By the way, you posted in the forum for Intel-based Macs. I've asked the Hosts to move this thread to the forum for PowerPC-based iMacs.

Regards.

It may help if we knew your approximate geographic location so someone doesn;t recommend a vendor who cannot ship to your location.

That makes life easier!

this firm lists several options:

http://www.dvwarehouse.com/iMac-G5-Power-Supply-c-4774.html&pltid=cccace79b4f5fc f871b871a5a715df8e

there are also some here:

http://www.powerbookmedic.com/xcart1/_search.php?page=1&q=imac+g5+power+supply&c ategoryid=

Looks like you will need to pin down your exact G5 variant to order the right one. You can use your serial number to determine your model here:

http://support.apple.com/kb/HT1758?viewlocale=en_US

There is a link near the top of the text that lets you do that.

If your iMac is too old for this to work, there are third-party sites with serial number translators:

http://www.everymac.com/ultimate-mac-lookup/