G5 booting issue

yawl

macrumors newbie
Original poster
Feb 24, 2014
2
0
I have an early G5 built in 2005 and running 10.5
Some times I have to hit the start up several times for the unit to boot up. Often the fans go into hyper drive without start up. Other times when unit is up and running fine the unit goes into hibernation when not be used. Contemplating as reset on the PMU switch.
Any thoughts?
David
 

repentix

macrumors regular
May 26, 2013
205
2
My g5 Has the Same Problem! When this problem with The hyperventilating Fans occurs I just Power the g5 down and wiggle the ram sticks a little bit .... that does the trick ;) I think it's some kind of connector or ram problem

Also Check your hibernation settings
 
Last edited:

Intell

macrumors P6
Jan 24, 2010
18,872
368
Inside
G5's cannot hibernate/safe-sleep. They can sleep, but not hibernate as laptops and G4 PowerMacs can be modified to do.
 

eyoungren

macrumors Core
Aug 31, 2011
21,251
13,094
ten-zero-eleven-zero-zero by zero-two
There was an issue with the G5s oh so long ago that if you let them sleep they would not wake up and you were forced to shut them off and turn them back on. Apple "fixed" this with a firmware update, but I've since then always set the G5 I use to never sleep. I let it turn the monitor off, but not sleep.

I know this is not entirely related to the issue here, but maybe setting the Mac to not sleep might help.

Of course that G5 was on 24/7 (including weekends and holidays) and my boss was paying the power bill each month…
 

AmestrisXServe

macrumors 6502
Feb 6, 2014
263
1
This is again, likely a sensor issue.

See my posts in this thread.

I've had my share of these problems with G5 units.

Flowchart for G5 Fan Speed Concerns:

Zap PRAM;
Check airflow door light sensor;
Dust system with compressed air (can, or compressor);
Reset PMU;
Run Apple Calibration test;
Update Firmware;
Check HDD position; some systems default to one bay or the other;
Check primary components (RAM, HDD/SMART Status).