I have Mac Mini 1.66 Intel 2006 OS X 10.4.11 with CD-R and DVD Player that won't boot properly into single user mode using a IBM PC keyboard. I have tried the alt-s, windows key-s and control-s key combinations. from the mac keyboard hints sheet located on this web site. I have also tried to boot with key combinations from the mac mini manual with no success. I have also tried to simply insert the install CD/DVD for MAC OS X 10.4 that came with the computer and start the computer with various key combinations and the cd/dvd drive will not boot. What do I need to do to be able to accomplish these tasks with the PC/ Windows keyboard. Frustrated at the boot prompt!