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It is almost definitely a hardware incompatibility. The drivers for Rhapsody are pretty limited. You could try messing around in OpenFirmware to trick it into using other more compatible drivers, but I’d be surprised if any would work for a slot loader. If I had to guess, I’d think it’s a graphics driver issue.
The op specifically states compatibility with this iMac (powermac2,1) though I was skeptical too.
 
I’ve just installed 1.2v3 on a Lime Slot Loader (Powermac2,1). It boots, but once it tried to load the desktop, it sits on the purple background with the menu bar (unpopulated) flashing randomly.

I searched this thread for “iMac” and there is no mention of an iMac on rhapsody.org, so I’m not really sure where to go from here.
The drivers for Rhapsody are so limited that if you try to install it on a Lombard, you are advised to only do it on the lower 333MHz model as that came with a CDROM drive. it won't work with the DVDROM drive of the 400MHz model although it works with the DVDROM drives of the supported Powermacs. It is just a bag of hurt as an OS.
 
That seems to be the common consensus, but I have installed it on my 400 mhz Lombard and it works fine. So I think there’s some variance with that.
 
That seems to be the common consensus, but I have installed it on my 400 mhz Lombard and it works fine. So I think there’s some variance with that.
I'll say. My Clamshell iBooks are supported but it resolutely refuses to install on any of them. It's just spiteful like that.
 
The drivers for Rhapsody are so limited that if you try to install it on a Lombard, you are advised to only do it on the lower 333MHz model as that came with a CDROM drive. it won't work with the DVDROM drive of the 400MHz model although it works with the DVDROM drives of the supported Powermacs. It is just a bag of hurt as an OS.
I'm using an iMac not a Lombard (though I could use a Bondi instead of the slot loader).
I also feel like to the OS an optical drive should be an optical drive, weird that one works but not the other.

But, does anyone have any tips on whats going on with my install, how I could make it work? It's listed as compatible in the OP, and from what I remember, flashing the menu bar like that is a video driver issue isn't it?
 
I tried every possible jumper-setting with the DVD-Drive and the harddrive... I can not fix this issue. Seems to be an incompatibility with the drives or the machine in general.
https://www.nextcomputers.org/forums/index.php?topic=4590.0 See if this has any answers.

I'm using an iMac not a Lombard (though I could use a Bondi instead of the slot loader).
I also feel like to the OS an optical drive should be an optical drive, weird that one works but not the other.

But, does anyone have any tips on whats going on with my install, how I could make it work? It's listed as compatible in the OP, and from what I remember, flashing the menu bar like that is a video driver issue isn't it?
I would assume it is a video driver issue. It could also be a problem that occured during install. Somewhere on the site linked above, somebody shared a fully working, installed image of 1.2v3. If you dd that onto a drive and it has the same issue, it's not the install. At that point, you'd have to muck around in OpenFirmware to try to trick it like the guy who got it working on a Pismo did or the way they get Clamshell iBooks to work with the higher res screens. A Bondi would have a much higher chance of working. EDIT: found it: https://nextcomputers.org/NeXTfiles/Software/Rhapsody/Rhapsody_5.6_G4_Cube/
 
I'll say. My Clamshell iBooks are supported but it resolutely refuses to install on any of them. It's just spiteful like that.

which clamshell? the PowerBook2,1 is "supported" although if your running the official OS9 based installer you might need to go into options and tick the "allow install on unsupported configurations" same sort of thing ya need to do to install it on a PowerBook 3400c for example :)

but the PowerBook2,2 Clamshell, the Firewire one is completely unsupported, although I suspect if you do some OpenFirmware finagling, change the model identifier to PowerBook2,1 it may boot up :)
 
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