here we can see the Encore/ST "Duet" 1.6ghz
SG4D-1600 2@1.6 GHz 2@512KB 102GB/sec
https://web.archive.org/web/20061230060929/http://www.sonnettech.com:80/product/encore_st_duet.htmlhttp://www.sonnettech.com:80/publicfiles/pdfs/pdf_datasheets/duet_datasheet16.pdfalot of companies are really bad at obscuring their older information + not dating their products
it appears that sonnet routinely upgraded their "Encore ST" G4 cpu upgrades,
because as time progresses on the web.archive.org backup server, if u check the page for the MDX duet g4 cpu upgrades, the ghz rating of the cpu is changing from month to month, starting at dual 500 and workin its way up to dual 1.8ghz i think?
so our original poster here has the 1.6ghz model, from my quick look it appears this model came out around the end of 2005 or some time during 2006
now dont yall remember the thread just a few weeks or months back where i was linking to the cpu plugin enabler file? and i was telling the guy to try the newer version? i cant find the thread.. so i have to try to dig up the same info again:
ok here is the link where the info is:
https://web.archive.org/web/20070204105354/http://www.sonnettech.com:80/downloads/proc_upgrds_sw.html and the thread was:
http://www.macos9lives.com/smforum/index.php/topic,4281.msg29516.html#msg29516ive attached what i think is the v3.1 sonnet processor cpu plugin
its called ce_install because ce stands for "Crescendo / Encore"
which is the names of both of the biggest/main cpu upgrade products from sonnet
albeit somewhat confusing to even me, to put the word Crescendo in front of Encore..
if u ask me these companies were confusing on purpose.. just to make more money on selling tech support to the world..

anyway
ORIGINAL POSTER:
try this v3.1 of the sonnet cpu plugin file
CLICK HERE:
http://macos9lives.com/smforum/index.php?action=dlattach;topic=4374.0;attach=5159i think it can solve your booting problem
here i will paste the description for the cpus plugin file from the original sonnet page:
Description: This unified installer installs files necessary to support various Sonnet processor upgrades in the listed applicable computers.
This software is not necessary for Encore/ZIF G3 nor Crescendo/7200 upgrades.
Version 2.3.1 adds support for additional Power Mac G4 ROMs, and adds full support for correct processor speed reporting under Mac OS 9 for Encore/ST G4 upgrades.
This installer now also installs (or updates) the Startup Disk X control panel, and moves the original Startup Disk Control Panel to the Control Panels (Disabled) folder. This control panel enables universal switching between Mac OS 9.x and Mac OS X System Folders on systems where Mac OS X has already been installed.
Note: If you have altered the extension name (ie: added spaces to the file name) of a previously installed version of Crescendo, Sonnet Processor Upgrade, or Encore, this installer will not automatically remove the previous version. You must manually remove it from your Extensions Folder.
as you can tell from the description it seems they expected people to be dual booting 9 + X.
ps:
admins might want to think about making this sonnet file more prominent download
as many people who come to this site have sonnet-upgraded macs