Hi, I am having the same experience with 10.5.6 and Optiplex 745. iDeneb 10.5.5 installed with Patches worked like a charm! The trying to upgrade with iDeneb 10.5.6 upgrade has been impossible. I tried everything from the various posts, i.e. voodoo, chameleon x.12, DSDT patching, etc. etc. Nothing worked. I am getting the same error of "Still waiting for root device".

This is especially painful, because using the same known techniques on another computer I have (ASRock MB) I installed iDeneb 10.5.5 and then I upgraded to 10.5.6 and later to 10.5.7. No major issues, following the usual methods I did it and it worked fine!

My Optiplex 745, however, is my main PC, and I would love to get it upgraded. Watching and reading carefully to see if anyone can do it, and how!

Thanks,
Aposdimi