My hackintosh conversion of the Advent 4211 is going nicely.
However, the graphics card does not always get picked up correctly and I get an incorrect resolution 800x600. The workaround is to delete the kext cache which you can do by using kexthelper to install any old kext and reboot(the system rebuilds the cache), or use scripts to do it on shutdown / startup.
Look for the files /etc/rc.shutdown.local and /etc/rc.reboot.local. If they exist then add the lines below. If not create them, and then make them executable:
sudo touch /etc/rc.shutdown.local
sudo touch /etc/rc.reboot.local
sudo chmod +x /etc/rc.shutdown.local
sudo chmod +x /etc/rc.reboot.local
the lines you need to add. If the files already existed then add at the top of the file.
#!/bin/bash <----- if the files already exist then not required
rm -rf /System/Library/Extensions.mkext
rm -rf /System/Library/Extensions/Caches/
rm -rf /System/Library/Caches/
After this you should get 1024x600 all the time