first step is to install Morphos on HDD/SSD
If you run Morphos from LiveCD the fans runs on highspeed
second - go to the open firmware and put this line
setenv boot-device hd:,\\:tbxi

third - you can use tool
https://www.morphos-storage.net/?page=System%2FMonitoring&file=iMacFanCtrl_0.2.lha

Finally I swept my hdd today. Compared to the Powerbook that process was rather stright forward. The 2.5" ssd looks a bit lost in the 3.5" bay, but it is fixed with two screws. it should safely stay in position there.
Now the system get's customized, then registered and then the mini evemtualyly may get retired as main machine.

I've got last week an iMac G5 12.1, too, and it works very good with Morphos 3.13, except of course the missing boot-picture. But a much bigger issue is the not working Wifi. If the Wifi is turned on during installation, the computer will freeze after short time, if I open a window I will get the message "Application is meditating". With Wifi switched off during installation and Internet through good old LAN there is no problem at all.

Wifi just works here and AFAIR it has done so "forever" (not 100% sure bout the 3.8alpha I had on it years ago), so it might be an HW issue.

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We got reports that the WiFi driver freezes with specific AP/WiFi setups, especially cable modem routers supporting 802.11AC. They seem to send something hostile to the 802.11B/G driver but we weren't able to identify the issue yet.
Which type/brand/model of AP/Router H/W do you connect your wireless equipment to ?

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Can you show the screen with OSX SYSTEM PROFILER and ACTIVE PROFILER with 4GB memory information?
For me, Morphos shows over 1.8GB, but OSX somehow does not see it. Neither 10.4 nor 10.5.
Maybe 10.6 will see?
It has been possible recently.

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If I remember, the system profiler doesn't recognized memory details, but OSX recognized total size of 4.5GB - see post#29. I will check and post picture with profiler. I have OSX 10.5 installed - latest for PPC, 10.6 is for Intel Macs only.
And ~1.7GB is today's maximum with MorphOS.

Yes,. I read the post. ACTIVE PROFILER shows that OSX uses only 512MB and the rest on virtual memory. No information about these 4GB DDR2. How can you check and confirm that OSX, however, uses 4.5GB of memory.
OSX 10.6 now works on PPC

OSX 10.5:
iMac-MEM.jpg

DebianSid:
iMac-MEM-lnx.jpg

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That is very cool! Time to go Ram hunting for my iMac too!

p.s. Does MorphOS pick up all 4.5gb too?

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Did anybody test it in real?
Are there any advantages over 10.5? Drivers for better GPU, boot from raid, etc... ?
And what about new applications for 10.6 ? Aren't they distributed as intel-exe only and not universal binary?

> Does MorphOS pick up all 4.5gb too?

The iMac doesn't magically change the 31-bit addressing of MorphOS, which means 2 GiB RAM maximum. Minus address space for I/O etc. that's about 1.7 GiB usable RAM remaining. This is valid in general for current MorphOS, no matter the hardware platform.

>> OSX 10.6 now works on PPC

> Did anybody test it in real? Are there any advantages over 10.5? Drivers
> for better GPU, boot from raid, etc... ? And what about new applications
> for 10.6 ? Aren't they distributed as intel-exe only and not universal binary?

I recommend skimming over the linked thread. It's all discussed in there :-)

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Makes sense, didn't even think of that. Saves me some money then :)

Thanks for the screenshots.
Now everything is clear.
My memory (not samsung) behaves the same as yours.
I was surprised by the large use of virtual memory at 4GB. Apparently that's how OSX does.

Hello! I'm wondering if the fans issue is still here after the new updates. I've wanted to buy an imac since 3.12, but the temperature/fans problem is holding me back :)

Thank you.

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On my iMac G5 20" iSight running MorphOS 3.14, I solved the overheating problem using Frank Mariak iMacFanCtrl 0.3 tool (version 0.2 works with MorphOS 3.13 but not with the latest MorphOS update).
This tool allows to manually control fan /temperature avoiding issues and hardware failures with too high
temperatures when the system reaches too high CPU load.

As for the fan issue, I think in this thread it was well explained by sailor (post # 14) how to fix it ...

It is actually a bit uncomfortable to have to increase the revs of the three fans after each boot.
Surely, it would be more convenient to be able to automate this process during boot and live peacefully without the fear of forgetting to adjust the fans with the risk of frying GPU or other hardware, but unfortunately I don't know how to do it.

Strange, I've never had issues with mine.

The fans ramp up when needed and the temperature is properly controlled without any extra programs.

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In my case, without manually adjusting fan speed via the iMacFanCtrl tool, after about half an hour of normal use (without major commitments for the CPU) the temperature systematically rises from 45°C (just after boot) to 78-85°C and the Northbrige controller also reaches beyond 90°C. In this situation, I do not hear the fans start automatically and I suppose that in such temperature conditions hardware damages would be almost inevitable.

In your case, at what temperatures do the fans automatically increase?

Probably Frank could clarify our doubts about the automatic adjustment of the fan speed to the temperature increase.

My fans ramp up drastically at about 85c cpu ( northbridge sits at about 72c at that stage )

It sounds like a jet for a second or two then drops the cpu temps quickly to about 75c and it gradually goes down then.

Normal usage for me it sits at about 65c - 70c for the CPU and 70c for the northbridge

If you want to do it automagically at every boot, you can add this in your user-startup :
Code:

You can modify 2500 by a number between 0 to 5000 (but 0 is maybe not a good idea ^^).

--
/me doesn't put those lines in his startup but it's a good idea ^^

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Where did u find that talk2smu_setfan command ?

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This is no official tool, actually. I will probably release another update to the fancontrol UI tool that allows to define some minimum rpm values on startup.

Thank you for your answers. Looks like it's safe to get one now :)

i bought today an isight for 100 euro from a german dealer, in the past i used morphos but my machines had broken they were all g5

Hello:)