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PostPosted: Sun Jul 19, 2015 1:14 pm 
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I just found this site today!!
Not a really new topic: Mac Pro G5 dual 2 GHz, wont boot beyond apple logo, fan speed high.
I tried most everything I found on Apple discussions.
Boot with Command-S, I get a header displayed down to DART but no cursor; no response to keyboard
Boot with Command-Option-O-F, when i enter commands: I get to reset-nvram OK; set-defaults OK; reset-all and NO response; have to shut down using power button.
Will boot using Apple Hardware test disk, extensive tests show no issues.
Did complete power down, removed drives, battery video card, left sit over night. Cannot get second chime ever using Command-Option-P-R

Any other ideas would be most welcome


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PostPosted: Sun Jul 19, 2015 2:39 pm 
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Welcome aboard hag531 ! :welcome:

It's a slow time for the forum,but we'll try! :)

Did I try to help you with this on Apple's forum?


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PostPosted: Sun Jul 19, 2015 2:47 pm 
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Oh, I did, check you PM.


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PostPosted: Mon Jul 20, 2015 9:46 am 
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The high fan speed means the OS never assumes control over the fan controller, so it starts out slow and slowly ramps up to maximum waiting for the OS to take over. This can happen for any number of reasons, not just hardware failure but also software corruption.

Can you try booting off different medium? A 10.4 or 10.5 install DVD? Your OS installation could be corrupt, only way to know for sure is to try another OS installation. If you have a 2nd HD you can afford to use for this purpose, a fresh install of 10.4/10.5 would be the ideal test of this theory.


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PostPosted: Tue Jul 21, 2015 10:10 am 
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Thanks for the info.
For some reason or other, no matter what the source OS disk is-hard drive, original install disks, etc I never get passed the apple logo.


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PostPosted: Tue Jul 21, 2015 10:40 am 
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Ah, I see you did post here! :oops:

One test if you would care to... pull at least the Data cable from the HDD & see if it boots from the Install Disc then.


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PostPosted: Tue Jul 21, 2015 11:10 am 
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That certainly sounds more like a hardware issue than an OS problem then. You could try disconnecting internal devices to see if it's still getting hung up trying to talk to the optical or HD, though that would require having a bootable Firewire drive (like the ever-elusive firewire optical drives). Maybe try flipping RAM around if you have >2 DIMMs, so try removing all but two then try them in combinations of 2.

BD will probably offer more constructive advice from this point, my G5 experience is limited.


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PostPosted: Wed Jul 22, 2015 11:59 am 
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More on failure to boot.
I loaded OS 10.4.6 on firewire drive, also had Apple 10.4.6 DVD in drive. Booted with Option key, HD, DVD and firewire showed up as boot options. Selected firewire drive, it booted to Apple logo and stalled. Did the same with original G5 install disk. Same results.
Does anyone know: why booting with Command-S, getting the screen but can't any commands such as /sbin/fsck-fy?
What prevents the OS from loading from any source?
Why I can't get a second or third chime using Command Option P-R at power up?
Any ideas most welcome.


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PostPosted: Wed Jul 22, 2015 12:06 pm 
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Did you try disconnecting the internal drive yet?


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PostPosted: Wed Jul 22, 2015 12:17 pm 
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I did once without the firewire. I'll try it again without HD tomorrow.
Thanks


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PostPosted: Wed Jul 22, 2015 10:47 pm 
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To me this sounds like a hardware issue, and in my (limited) experience repairing G5s is a pain due to thermal calibration and whatnot...BD is much more familiar with this stuff than I am, although I've owned three G5 towers.

At any rate, normal hardware troubleshooting probably applies. After disconnecting peripherals and disks, next test the RAM and video card, then suspect the motherboard or one of the CPUs, with the less likely possibility of a power supply problem.

The RAM is probably fine, but it's worth checking since it'll be the next easiest thing to test. If you have multiple pairs installed, first pull out one matched pair, see if the solve the problem, and if not, put that pair back in and try the other. Be careful to match the pairs of DIMMs appropriately; Apple shows how to do so here.

The problem probably also isn't the video card, but a bad video card can sometimes do things you wouldn't expect. It's hard to test without a spare card.

I vaguely suspect motherboard problems are more common on these systems than CPU problems, but can't say for certain because I was out of the repair business by the time these machines were released.

I have a few spare parts I could send for the cost of shipping, but I don't know which ones work correctly, and I know don't have a working motherboard. I suspect that if the problem isn't something really simple it'll be easier to buy a whole new machine than try to repair the current one. BDAqua might be more optimistic and I'll defer to his judgment on the matter.

- Anonymous


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PostPosted: Thu Jul 23, 2015 9:33 am 
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I tried booting from a firewire disk with no other drive connected. Same result: logo and grey screen with eventual fan speed-up..Also tried different video cards, and reduced RAM.
I conclude the problem is somewhere in the HDW -the MLB?
Thanks to all for the many suggestions.


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PostPosted: Thu Jul 23, 2015 9:54 am 
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G5 failure rates...


G5/1.6 single (June 2003), D- (24%, logicboard, hard drive)
G5/1.8 single (June 2003), D+ (19%, logicboard, video card)
G5/2.0 dual (June 2003), F (32%, video card, logicboard)
G5/1.8 dual (Nov. 2003), F (27%, logicboard, optical drive)
G5/1.8 dual (June 2004), D+ (19%, logicboard, optical drive)
G5/2.0 dual (June 2004), C- (17%, logicboard, hard or optical drive)
G5/2.5 dual (June 2004), F (26%, logicboard, hard drive)
G5/1.8 single (Oct. 2004), D+ (19%, hard drive, logicboard)
G5/2.3 dual (April 2005), B- (11%, logicboard, power supply)
G5/2.7 dual (April 2005), D (22%, logicboard, power supply)
G5/2.0 dual-core (Oct. 2005), C- (18%, power supply, logicboard)
G5/2.3 dual-core (Oct. 2005), C- (18%, power supply, logicboard or optical drive)
G5/2.5 quad-core (Oct. 2005), C- (17%, logicboard, power supply)

http://lowendmac.com/ppc/power-macintosh-g5.html


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PostPosted: Fri Jul 24, 2015 11:06 am 
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BDAqua wrote:
G5/2.3 dual (April 2005), B- (11%, logicboard, power supply)
Hooray, I got a B-


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