I got an old iMac G3 sold as not working, but to my surprise it actually displays the osx boot screen with the grey apple logo, and then the hdd starts to make some very unpleasant noises, so the harddrive is definitely on its way out.
I connected a wireless logitech mx keys keyboard to it, but it doesn't seem to take any of the usual keypresses at bootup that would enable open firmware or selecting a different boot drive... no matter what I press, it always just tries to boot osx and fails.
Any idea what I could try? Does it need a wired keyboard? Does it need an original apple keyboard? The one I have can be switched between mac and windows mode, and I set it to mac, but it didn't make a difference.