The Power Macintosh G4 is series of personal desktop computers released by Apple in 1999, and sold through 2004. This page is for the M5183 designation.

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Doesnt turn on anymore, need new power supply?

Hi, I have an old G4 / DP 450 Mhz . A few days ago, the circuit breaker of my appartment went off a few times because of using too much power (Old installation). Afterwards i couldn't turn on the computer anymore. I understand it might be the power supply. Can you advice me on what to do? Do you have those part available at the store, how much it would be?... I'm trying to see if it's worth saving this old machine... Many thanks in advance for your precious advice and looking forward to hear from you

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Deck the Halls
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First i would check to see if you are getting power to the wall outlet. Also try to determine what other things are drawing power from the same circuit to see if you are overloading it. Try a different outlet that draws power from a different circuit than the current one. Do you smell anything burned? Does it blow the circuit as soon as it's plugged in or when you turn the power on? Here is an exploded view of all the parts for your machine with the part numbers: http://ep.yimg.com/ca/I/lovemacs_2113_37...

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Beat me again. +

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Try this link to see if your power supply is faulty : http://docs.info.apple.com/article.html?...

I have the same computer and my second power supply died in it this week. After opening up the power supplies I found some cracked resistors (actually the same in both power supplies). I'm waiting for parts right now... I'll keep you posted when I'm done replacing them. I might as well write a guide to help other in that situation.

Since this computer has gone vintage, it's quite hard to find a power supply for it... You may want to try eBay or classified adds.

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This hyperlink takes you to Apple Support, there's no article. I could really use it if you still know where it is.

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Also, I would love to have some info on the power supplies, as far as repairing them. I'm on my 2nd one and now I might need a 3rd. Would rather repair than replace. Are you a member of Apple's discussion forum? I've posted my issue there with details.

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The link is probably dead because the computer as been vintage for too long... I did try to fix the PSU with no success as I was not able to get the schematics for it to help troubleshooting. I did however make a guide to convert your Mac to any standard ATX PSU, but it is not posted here. I can send it to you if you give me your e-mail address.

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Are you a member of the Apple discussion forum?

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I bought my G4 summer of 2001 and am still using it ( 3/7/17) for desktop publishing, currently building a twice monthly community newspaper averaging 40 color pages. So, yes, vintage G4s are worth maintaining.

Today, a nearby lightning strike took out my power supply and I was able to replace it using the instructions on this site. (Plus, I have a spare G4 I borrowed from!)

I plan on using this G4 until it melts!

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The power supplies are dead easy to fix.

1. Due to their age, the fans normally seize up and cause all the caps to over heat

2. The primary stage blows up.

Do not forget that a flat PRAM battery can cause power on failures.

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Not really. Maybe for you but for people who have no or minimal soldering experience and the fact that solder in those things is a massive pita to get to melt sometimes. Its not always that easy, ive had psu's with fans that were fine have blown caps. And normally with a circuit breaker constantly tripping, there was probably a surge back into the psu causing more than just a few caps to break.

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In that case - check the VDR's.

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