Sorry for my late answer,
my hardware is:
optiplex 760, C2D 3.16Ghz, asus en210 silent 512M. changed the CD rom to been able to auto sleep.
latest bios on the optiplex.
Hi all,
sorry for my late answer, I just followed the info on this post:
http://www.insanelymac.com/forum/topic/275921-updated-dell-optiplex-760-sff-setup-for-ml-lion-sl/
I did a clean extraction of my DSDT and with a diff tool I changed all the thing for usb and ahci. That's all.