Power Mac G4 MDD - Has difficulty booting after shut down

I have a Power Mac G4 MDD (1.25Ghz) that is having issues when it is shut down. The power button on the front of the machine does not start the computer every time. Sometimes it works, sometimes I need to wait a while before it will work. When the button is pressed, it does not light up or anything.
I have noticed that if I sleep the computer it always seems to wakeup when the front button is pressed. But if I shut down the G4, is does not always bootup.
I have also performed multiple restarts when performing software updates, and they always seemed to work fine.
I have changed the Saft battery inside - it was at about .4v
I have performed a CUDA/PMU reset using the button on the motherboard, and followed the Apple procedure. (disconnect power, and accesories, press reset button, wait 10 seconds, reconnect, restart) It did not restart right away, had to wait 20 minutes or so.
The G4 has a new installation of Tiger, with all of the updates.
I have not checked the PSU, but plan on doing that soon. Just seems odd that it only has issues when the machine was shutdown. Seems to start after it sits for a while, but last night I was switching monitors, and shut it down, switched monitors, and it would not re-boot.
Any ideas?

With the "sometimes" nature of the problem, it could be the front panel board, a much cheaper replacement than a PSU. An Apple tech told me that one way to test the front panel board was to find one of the first Apple USB keyboards for the original iMac. The early ones have a power button like the old ADB boards that overrides the internal board/button. He said that, should the Mac start reliably from the old keyboard, then there is trouble with the front panel board. The Apple model number for the USB board with power button is M2452.
Very helpful forum member japamac has a test procedure for the MDD PSU on his site here:
http://jcsenterprises.com/Japamacs_Page/Blog/D275729F-09DA-4FBB-96B3-BEEEB2C0461 9.html
You'll need a multimeter to check the voltage levels.

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Power Mac G4 won't start up after shut down

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My Power Mac G4 MDD has no DVD drive how do I pair it install OS X on my new HD.

Hi, two ways...
Put the Install Disc in another Mac tathas Firewire, put the other Mac into Target mode...
http://support.apple.com/kb/HT1661
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Or an external FW DVD...
http://eshop.macsales.com/item/OWC/MRF82SD24LS/
Oh, & a thiird way...
http://eshop.macsales.com/shop/optical-drives/superdrives/powermac/mdd

G4 Power Mac (MDD) - has trouble booting after shutdown

I have a Power Mac G4 MDD (1.25Ghz) that is having issues when it is shut down. The power button on the front of the machine does not start the computer every time. Sometimes it works, sometimes I need to wait a while before it will work. When the button is pressed, it does not light up or anything.
I have noticed that if I sleep the computer it always seems to wakeup when the front button is pressed. But if I shut down the G4, is does not always bootup.
I have also performed multiple restarts when performing software updates, and they always seemed to work fine.
I have changed the Saft battery inside - it was at about .4v
I have performed a CUDA/PMU reset using the button on the motherboard, and followed the Apple procedure. (disconnect power, and accesories, press reset button, wait 10 seconds, reconnect, restart) It did not restart right away, had to wait 20 minutes or so.
The G4 has a new installation of Tiger, with all of the updates.
I have identified that the PSU is dropping the standby voltage on Pin 1. It does not do it consistently, but when the 25v is missing from Pin 1, the G4 does not start. After a couple of minutes, I can see the voltage return to Pin 1, and the unit starts no problem.
Before I look for a replacement PSU (which seem pretty expensive), I was wondering if anyone knows if this is purely a PSU issue, or does the CUDA/PMU influence the standby voltages?

With the "sometimes" nature of the problem, it could be the front panel board, a much cheaper replacement than a PSU. An Apple tech told me that one way to test the front panel board was to find one of the first Apple USB keyboards for the original iMac. The early ones have a power button like the old ADB boards that overrides the internal board/button. He said that, should the Mac start reliably from the old keyboard, then there is trouble with the front panel board. The Apple model number for the USB board with power button is M2452.
Very helpful forum member japamac has a test procedure for the MDD PSU on his site here:
http://jcsenterprises.com/Japamacs_Page/Blog/D275729F-09DA-4FBB-96B3-BEEEB2C0461 9.html
You'll need a multimeter to check the voltage levels.

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Power Mac G4 MDD not powering up after battery change and pci reset

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http://www.alsoft.com/DiskWarrior/index.html
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Power Mac G4 MDD Will not Boot

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If your MacBook is a 2008 model see this
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Hi
I'd start by checking the basics if you haven't already.
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5. Replaced Motherboard with a known good spare I have.
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I have not reseated ALL the connectors but I will try that first tonight. I removed the AC last night so when I get home I will power it up and try again. When I can get it to boot reliably, it's usually been following an AC outage overnight or a couple of days.
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Power Mac G4 MDD No video past boot

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Problem:
After pressing power button, I get the start up chime and the loading circle at the bottom of the Apple screen then it flashes a blue screen and the display does black and displays input not supported.
I have a 19" wide screen Acer LCD screen connected capable of at least 1440x900
What I've tried:
CMD-OPT-P-R
C
SHIFT
CMD-OPT
CMD-OPT-A-V
CMD-OPT-SHIFT-DELETE
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Power Mac G4: Display Compatibility...
http://support.apple.com/kb/HT1825
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I have a Power Mac G4 MDD 1.25GHz with a 15" Apple display and running 10.4.
I can not wake the computer up from the sleep mode. It will not respond to the mouse moving, a mouse click, a keyboard key, the power button on the display or the power button on the computer.
The only thing I can do is force the computer off by holding in the power button (on display or computer) and restarting the computer.
The computer is set to go to sleep after 1 hour of no use (or the issue happens if I put it to sleep).
Any thoughts would be great.

This is for a Mac that won't sleep.
Here is KB article HT1776 with their tips.
Mine follow;
USB devices and hubs often cause Macs to not sleep or wake quickly from sleep (notably HP printers and scanners, HP all in ones, and Cannon scanners). Disconnect all USB except for keyboard and mouse and try. If it sleeps, add one back at a time testing after each one to find the culprit.If you've set your Mac to receive faxes, it may not be able to sleep. It might also have a damaged preferences file.
If you use your Mac for faxing, open System Preferences. click Print & Fax, click the Faxing tab, and uncheck the Receive Faxes On This Computer box.
If that doesn't work or you've never faxed on your Mac, go to Finder/Hard Drive /Library/Preferences/SystemConfiguration and delete the com.apple.PowerManagement.plist and com..apple.AutoWake.plist files (if your Mac asks, type your admin. password).
If the latter file isn't present in the folder, go to user name(probably your name)/Library/Preferences, delete the com.apple.systemuiserver.plist file, and reboot your Mac.
Hope this helps!
P.S. One member here reported this (Michael Gleason);
"I have had this problem with my IMac G5. It is surprisingly irritating. LaCie's Silverkeeper backup software was the cause. By default it gave itself permission to wake up the computer to check if a backup was needed. Do you have this or a similar program installed which has scheduled activities including wake-up permissions as an option?"
Dave Hamilton provided this link, xlr8yourmac.com, to a member, which addresses failure of deep sleep with some users that updated and added new FireWire and USB cards.
Also, here is Apple doc.#305262 about PCI cards and sleep.
tomhorvat adds this; After few days of messing around I found out that I had desktop background (wallpaper) set to change every 1 minute.
After unchecking "Change picture..." in system preferences (under Desktop/Screen saver), my powerbook went to sleep all by itself.
Tristan Currier noticed this; "I have a Canon printer(shared) and my imac would not sleep. I opened up printer/fax in system prefs and noticed it said the printer was in use when it was off. Opened up the printer queue and noticed about 7 pending documents. Deleted them all and now it sleeps.
Check the printer queue!"
Good Luck!  DALE

Power Mac G4 MDD - Has difficulty booting after shut down

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