My vintage Power Mac will not power on. The power on button lights up, but dims after releasing the button. What is the problem?

My vintage Power Mac will not power on. The power on button glows bright when pressed, but dims to off after releasing the button. What is the problem?

The battery is the PRAM battery:
Your Mac stores certain settings in a special memory area even if it is turned off (unless there is a battery issue as described below). On Intel-based Macs, this is stored in memory known as NVRAM; on PowerPC-based Macs, this is stored in memory known as PRAM. Information stored in NVRAM or PRAM may include:
Speaker volume
Screen resolution
Startup disk selection
You may need to reset the NVRAM or PRAM if you experience issues related to these functions. For example, if your Mac starts up from a startup disk other than the one you've specified in Startup Disk preferences, or if a "question mark" icon appears briefly when your Mac starts up, resetting NVRAM or PRAM may help.
http://support.apple.com/kb/HT1895#
Replace the battery and reset the PRAM.
Resetting your Mac's PRAM and NVRAM - Support - Apple
Can I purchase a replacement battery at Walmart?
Likely not.
Order one at OWC for the best price ($20+ at Radio Shack):
NewerTech 3.6VPRAM 3.6v Lithium 1/2 AA PRAM... in stock at OWC
But have not sure what a PSU is or how to test it.
PSU- Power Supply Unit.
Then the steps that I deswcribed may be a bit advanced for you?
The PSU is the gray box at the top rear of the interior, the box to which the power cord is attached and has the fan blowing hot air out.

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Message was edited by: Brian Hoisington

Hi, and a Warm Welcome to Apple Discussions and the Power Mac G5 Forum!
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http://docs.info.apple.com/article.html?artnum=300341
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http://www.mac-pro.com/Mac-Pro-Online-Store/PowerMacs-Intel-MacPro-Towers
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https://selfsolve.apple.com/agreementWarrantyDynamic.do
http://www.chipmunk.nl/klantenservice/applemodel.html
http://www.appleserialnumberinfo.com/Desktop/index.php
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http://support.apple.com/kb/HT1349

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My vintage Power Mac will not power on. The power on button lights up, but dims after releasing the button. What is the problem?

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