@broadblues
as it happens I too am having problems accessing my dvd rw drives after OS4.1 Final is installed and the only way I can get the install disk icons to show up is with one of the dosdrivers from storage now in Devs. and also plugging in non usb mouse and keyboard
If I boot from the install disk everything works ok, but the installation has created problems wih my sound, I can't get the boot tune to play although the card works and with usb aswell. I had no such problems before installing final.
I'm not complaining, but it also knocked out my cygnix partition and I had to completely reinstall that.
work in progress.