New To Mac-Forums?

Welcome to our community! Join the discussion today by registering your FREE account. If you have any problems with the registration process, please contact us!

Get your questions answered by community gurus Advice and insight from world-class Apple enthusiasts Exclusive access to members-only contests, giveaways and deals

Join today!

 
Start a Discussion
 

Mac-Forums Brief

Subscribe to Mac-Forums Brief to receive special offers from Mac-Forums partners and sponsors

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

PSU keeps running after shut down on AGP G4


Post Reply New Thread Subscribe

 
Thread Tools
santosTom

 
Member Since: Sep 14, 2011
Posts: 13
santosTom is on a distinguished road

santosTom is offline
I have a PPC G4 AGP graphics model, 450 mhz single processor with 2GB ram running OS9.2.2 on a 120 GB Western Digital HD & OSX 10.4.11 on a 30GB Maxtor HD. When I shut the computer down (doesn't matter whether it is running in OS9.2 or OSX) the fan in the power supply keeps running as does the larger inside case fan, and a little red light near where the ram chips are mounted stays lit, similarly to how it is lit when the machine is running. It appears to shut down normally, and there is no signal output on the screen, however the fans are still running.....? For now I have been unplugging the machine when it is not in use to prevent the fans from running constantly however I am wondering why this is happening and if it is ok to just continue to unplug it when not using it? As soon as I plug the power cable back into the computer, the fans start running but it does not boot up until I push the start button and it then boots up normally into either OS/HD. If I don't push the start button, it would just sit there with the fans running. Is this a signal of an upcoming problem with the PSU? Any easy fix other than replacing the PSU?

So far I have tried: resetting the CUDA switch and the PRAM to no avail.

This machine runs a SCSI desktop drum scanner in our photo studio and is not used too often. It is one of two machines we have just in case one fails however due to living in Brasil at this time, and the fact that these older parts are not easy to come by down here, I am hopeful to solve this issue ahead of a more disastrous result . Also, because it is not used frequently, it is not an option for me to keep the machine running at all times.

Any help is greatly appreciated!
Thanks,
Tom
QUOTE Thanks
dtravis7

 
dtravis7's Avatar
 
Member Since: Jan 04, 2005
Location: Modesto, Ca.
Posts: 27,451
dtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond repute
Mac Specs: iMac 2.4 C2D 10.9.4, iMac 2.16 C2d 10.6.8, Macbook2007 10.8.4, Mac Mini 10.8.4, iPhone 3GS IPad1

dtravis7 is offline
It could be the Power Supply but it also could be the Logic board. I was going to suggest the PRAM but you tried that already.

There is also a Small PC Board on the front with the Power Switch. There is a Chip there. Seen that board cause issues like yours before.
QUOTE Thanks
santosTom

 
Member Since: Sep 14, 2011
Posts: 13
santosTom is on a distinguished road

santosTom is offline
Dennis,
I do recall that at one point we had trouble starting the machine by pushing the start button, as it seemed to be sticking. It did and still does require a very firm push on it to start up the machine. If I do not push hard on it, the green light comes on but the machine does not boot. I then have to hold in the start button until the light goes out and then push it again very firmly until I hear the chime. Do you think that this is the trouble as you mentioned seeing something similar to this issue before...?
Thanks in advance for any help!
Tom
QUOTE Thanks

Post Reply New Thread Subscribe


« Can I use this seagate drive with a Mac | Black border (left & right) on new LG monitor »
Thread Tools

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off
Forum Jump

Similar Threads
Thread
Thread Starter
Forum
Replies
Last Post
g5 imac isight psu gone.. again! djkus Apple Desktops 0 11-02-2011 09:14 AM
MacBook Pro Won't Shut Off ooohhhmeganbug Apple Notebooks 2 10-27-2011 08:33 AM
iMac G5 PSU adriangb Apple Desktops 9 03-04-2011 08:05 PM
Imac wont shut down tedwardian Apple Desktops 6 03-04-2010 05:09 AM
Power Mac G4 won't shut down vmholladay Apple Desktops 2 07-06-2007 08:15 AM

All times are GMT -4. The time now is 06:52 AM.

Powered by vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
X

Welcome to Mac-Forums.com

Create your username to jump into the discussion!

New members like you have made this community the ultimate source for your Mac since 2003!


(4 digit year)

Already a member?