I had brought it to the genius bar who couldn't determine any hardware problems and it worked with their network just fine. 10 other computers connected to the switch without problem. The machine is just out of warranty but did have a weird problem with network where it wouldn't recognize the network connected to a Netgear 716GS switch, no matter which port. Booting into diagnostic mode detects no problems for both the short or long test. I can't try target disk mode as I don't have a firewire cable handy. I've reset PRAM, held down option keys to select boot drives, etc. All DVD drives and USB drives are capable of booting the iMac. This tells the computer to load from the disc rather than from the internal hard drive.

The critical part is next: on system boot hold down the C key as the Mac boots up. In order to boot your Mac from a disk in the CD / DVD drive, you’ll first want to insert disk into the drive, then you can either shut down the Mac, or reboot the Mac. Vintage Classic Apple Macintosh System Boot Install Disk Floppy/CD Pick Version. Be sure the disc to boot from is actually bootable, most system restore and installation discs are. This happens regardless of whether it is a physical DVD or an external USB drive. Get the best deals on Mac Os X Install Disc and find everything youll. The symptom is consistent - it attempts to boot and then reboots about 10 seconds later. I have also tried to boot from 10.5 DVDs without any luck. I have tried by booting from DVD, a second partition with the ISO burned to it, and even an external USB drive that has a full install of Leopard Server on it that successfully boots up a 2007 iMac. I have a 2009 Mac Mini 2ghz that I was trying to install Leopard Server on.

Boot mac mini mid 2010 from dvd