eMac stuck - won't boot, won't eject disc I was upgrading from Jaguar 10.2.4 to Tiger 10.4.8 on my creaky old eMac. 

Inserted the Install disk. When it restarted, I got the chime and Apple logo, then it aborted and a bunch of (to me) gibberish:  "no debugger configured ... Latest stack backtrace...  Proceeding back via exception chain... Kernel version... Panic: we are hanging here..."

Tried several times, but always stops and same message.

Don't have a Mac keyboard so no keyboard eject.  F12 does not eject disc. At this point I would be content to just stick with Panther but it's stuck in limbo.
I don't know if it's still like that but you could try to keep the mouse button pressed while booting: it used to force a disc eject.