Forgive the long story, but I have a mix of old knowledge and unfamiliarity with Mac so I don't know what might be relevant. The tldr version is my iMac won't boot.
Trying to put op an upnp server: Windows Server on my Leopard Imac I found afterwards that the service planted itself. Trying to quit the process, immediately triggered a sort of reboot screen, and the OS responded, but still the service was not quitted.
I tried (I'm a former Win user, and not acquianted with unix - I picked up the command from a forum) with a sudo launchcntl -w to disable the service. By doing this, the mac spinning wheel appeared and nothing responded anymore.
I powered down the Imac. When trying to restart the boot reached the gray apple logo screen with the spinning wheel still there, as if it was still trying to disable WindowsServer. The keyboard locked immediately and caps light on.
Tried SMC reset, pram reset. As the keyboard was locked each time I tried, no luck. Now, the power button only responds when I first detach the power chord, and reattach it. Inserting the 1st install disk trying to boot from it and run diagnostics didn't work. Always the same screen with the spinning wheel, no keyboard response. DVD is even locked, and cannot eject it anymore.
Safe boot of course doesn't work as not one keyboard is accepted.
So, I'm dead locked on all sides. Must admit that windows still gave you a chance to boot. This mac is dead on a service disablement process. The damn keyboard locks, so I have no control. I whished there was a reset button like on the TC.
What to do ? I have no idea. Backup is not available on Time Machine.
Does this need hardware repair or does someone have any ideas.