5827 Views 4 Replies Latest reply: Nov 22, 2007 4:56 PM by Bill W
Welcome to the Apple Discussions!
Is the external DVD Firewire or USB? Only Firewire devices can serve as external boot drives for PowerPC (PPC) macs such as the eMac.
Holding the c key down at startup tells the Mac to try to boot from the internal optical drive. You want the option key, as described in Startup Manager: Select a Startup Volume. (You can also look at Magical Macintosh Key Sequences).
From your post, it does come across that you're using the Install discs from the Mac Book. Aside from the pesky legal detail that the Mac Book software is licensed only for use with the Mac Book, gray label OS X Install discs are model-specific and will only work with the model with which the discs were shipped (not to mention the Mac Book is an Intel CPU and the eMac a PPC CPU). You'll need the retail black-label Tiger or Leopard Install DVD to update the eMac.
Updating from 10.2.8 to 10.4.x will make your eMac feel much more responsive (assuming you have at least 512 MB RAM). There's a handy upgrade guide for Tiger in Gulliver - Tiger Upgrade Guide.