Power Mac 9600/200 won’t load/freeze with Sonnet G3 450

speedys123

New Tinkerer
Oct 22, 2026
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0
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I found a Power Mac 9600/200 on FB Marketplace and traded for it. Cleaned it up, replaced the PRAM battery, checked the caps. Powered it up and it worked fine. Booted into Mac OS. It came with a Sonnet G3 450 and it booted into MacOS, with Sonnet splash screen each time. I used it for about a week, put in a flashed Sun Radeon 7000 and it was working great connected via DVI. Added 128MB of RAM. It was running on a 36GB 80 pin SCSI drive with a converter. Everything about the computer seemed to be working ok.

Then the old hard drive it came with died. I was playing a game and the system froze. Restarted, disk ?. The drive spins up, makes some noise like it wants to boot but doesn’t. No strange noises, it just doesn’t detect a disk. It’s 20 years old, so not too surprised. Bought a different SCSI drive, formatted with FWB Disk took ans its not an Apple drive, installed Mac OS on that. No issues.

Tried to install the Sonnet v2.3.1 software and it installed. Restarted. Now the system freezes before it displays the Sonnet extension. It boots, loads the startup screen and then freeze. No matter what I do it will not successfully enable Sonnet Crescendo. No extension boot, works fine. Boots fine without Crescendo.

I’ve spent hours on this. Reinstalling Mac OS. 9.1, 8. Different versions of Crescendo. Different SCSI drives. Removing every extension except Crescendo. Using the FWB disk tool to update the drivers. Following the sonnet install directions. Resetting PRAM, resetting via the little red button on the main board.

is there something I’m missing? What is the correct process to freshly install MacOS and then install Crescendo on a 9600/200? The system worked just fine until the drive died and was replaced. Not it absolutely refuses to load Crescendo which seems like it should be a straightforward software load?
 

speedys123

New Tinkerer
Oct 22, 2026
2
0
1
Specs:

Original system:
Power Mac 9600/200

Now:
9600 w/ Sonnet Crescendo G3/450

RAM: 160MB, 4 32MB, 2 16MB in slots 6,5,4.
Hard drive: 80 pin SCSI 16GB or 50 pin SCSI 9GB from Free Geek Twin Cities. Same issue with both. Original drive as received was a 36GB with MacOS 9.1.
CD drive: Original SCSI
Video: Flashed Sun XVR-100 64MB Radeon 7000. Have original card but it’s not installed.
Monitor: Dell 22” connected via DVI
Network: Had Trendnet 10/100/1000 installed but removed it for troubleshooting.
 

phunguss

TinkerDifferent Board Vice President
Staff member
Dec 24, 2023
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Stillwater, MN
I think there were two motherboard versions: Tsunami and Kansas?

Is there a dimm in the socket between the ram slots (bank of 4 ram, offset socket, bank of 8 ram)? If there is a dimm there, try removing that. Also, try removing/cleaning/reseating the G3 card.

You can try removing extra ram down to your single largest DIMM and see if it will boot with just one.

Any options to recover extentions or data off the old drive?