Mike, Hold down the option key at startup with the CD in - do you see the available drives (including the CD)? Or does it give you a little rectangle for a password? One reason why a Mac would not boot from a CD or start in Single User mode is that the Mac has the Open Firmware password enabled. If you see the password box, then it has been enabled. If you see the drives, maybe you aren't pressing the keys early enough? Make sure you press immediately after hearing the startup bong. Hope this helps, Peter On Jun 21, 2005, at 3:40 PM, Michel Treisman wrote: > Is there any reason I don't know about why an iMac, or Mac OS X > 10.3.5 should not allow Single User Mode, and not boot up on a CD? > What is the next step? > "I felt something, a disturbance in the network, as if a million Mac zealots cried out in horror and were suddenly silenced." -- One Slashdot reader comments on Apple's switch to Intel. Peter Krug pkrug at mac.com