@ ppc-grinch - I have had, and am still having, no-end of trouble with v3.20 of MorphOS with my iMac A1145 iSight, which also has the X600 GFX chip on the logicboard. In fact I am fairly sure that a lot of the internal components will be very similar, if not the same, other than the smaller screen and probably the screen inverter is likely a different model. The main problem for me is that it refuses to go online with v3.20 as a standard ISO installation, but with a few tweaks and changes, sometimes reverting to the netconfig.library off the v3.18 ISO, at the suggestion of jacadcaps, there have been some degree of more usability, who seems to have made similar suggestions to other hardware users that have installed v3.20 and found themselves unable to get their networks working/recognised. The one more limiting factor seems to be that the Preferences GUI when you swap some of the network settings then goes inactive, and you then need to reboot, and you may not even have had any success getting online during those attempts to do so.

I have not had any GFX chip issues with my A1145, but it seems that this v3.20 may have got more significant issues that need fixing than any other version that was previously released, just my observation of discussions on this forum.

I have spoken with jacadcaps and still need to get back to him with more details about using it with my ethernet connection. He too has an A1145 iMac, so that is good for us to be, basically, on the same hardware to compare what works and what seems to be at conflict with the latest v3.20 operating system. At least that is the way it is with my system - conflicts with the OS.

I can install v3.20, but be aware that if you do get it installed OK, that the ogg.demuxer is Toxic/Broken and you need to disable, isolate, or delete it from the MOSSYS: Classes/ Multimedia until it is fixed, probably in v3.21 which for me, cannot be released soon enough ... once the issues that are affecting the iMac have been resolved completely.

If I was you, I would download both the v3.18 and v3.19 ISOs and re-install with v3.18 first of all and see how that works for you, bear in mind that the most recent version of Wayfarer you can use IIRC is v8.5 with v3.18 of MorphOS. With v3.19 the lastest version is v11.2, but I would advise you to try to install v3.18 first of all, and report back here your findings. If all goes OK with v3.18 then install v3.19 and then report back here with your results.

I hope this information is useful to you, especially as you have similar hardware to mine, though your GFX issues have not troubled me as yet, and I hope that they don't, but I hope that yours get resolved quickly.

I am currently running MorphOS on my iMac from the v3.19 MorphOSboot CD (registered - no timeout) sometimes from v8.5 Wayfarer, as I have advised you to try. I am not sure that there is not a problem with the Preferences GUI in v3.19's ISO, as I have described briefly above, but as you will work out, if I am using v3.19 though I can also use the v11.2 Wayfarer as well, which I am doing right now.

I feel sure that the problems we are facing currently with v3.20, well some of us at least, will be supported by the MorphOS Development Team to, hopefully soon, deliver a stable fully working version of MorphOS that we can all enjoy as we usually do.