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Apple Desktops Discussion of Apple's desktop machines including Mac Pro, iMac, Power Mac, and mini

Power Mac - only the fans run when I power up


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Robbwhite24

 
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I have a g4 powerpc 1.5gb ram, and 1ghz processor. I've tried taking off the hardware upgrades but still only the fans run when I power up, I think its a motherboard issue. Help please.
if I have to buy a new motherboard I would like to get one compatable with 4gb of ram and 4ghz processor and leopard, is this possible to accomplish, or worth it?
Note: with a 128gb hd with lots of expensive programs that I'd like to keep. Thank u.
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louishen

 
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what happens?

Does the front power button light come on then fade away

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You may be able to get a replacement processor or mainboard, but the kind of specs you're talking about are not possible on a G4.

You could try and have it repaired, or buy another used PowerMac as it would be fairly straight forward to pull back the data from your hard drive when you get your replacement machine.

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Robbwhite24

 
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When i press the power button the light fades away
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Sounds like my g4..lol thanks Zoolook
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before you start replacing motherboards, try replacing the battery first, that cheap part brought my G4 back to life and it is still going strong

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Quote:
Originally Posted by Robbwhite24 View Post
When i press the power button the light fades away
Perhaps this Apple Discussions thread will be of some help to you.

EDIT: If you wish, you can read this Apple KB article about resetting the CUDA as well.

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Robbwhite24

 
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Ok what does the battery do exactly?
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This description of the role of the PRAM battery is for a PowerBook but very much the same thing for your G4. it is critical, particularly if you have a MDD which will not boot with a faulty/dead battery:-

922-5205 (Clock PRAM) Battery For PB G4/DVI 667/800/867-1Ghz DVI, Apple Mac and iPod Accessories
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Thanks for your help but changing the battery didn't. I heard next thing to test is the power supply or motherboard.
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Quote:
Originally Posted by vansmith View Post
Perhaps this Apple Discussions thread will be of some help to you.

EDIT: If you wish, you can read this Apple KB article about resetting the CUDA as well.
Thanks but that didn't work either.
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is there an easy way of knowing if its your motherboard that has gone bad or your power supply?
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Disconnect the hard drive and see if it boots to the fashing ?
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