How can I wipe my imac hard drive if the imac is not recognising my keyboard

I fell into the same trap many others have with installing Windows via bootcamp & not setting up the hard drive formatting properly. So I've got a "Disk error. Press any key to restart message."
I've tried pressing command to get it to boot into OS and using 'c' to get it to boot from the OS cd. But my mouse and keyboard are not being recognised so these don't work.
I'm thinking that there must be a way to wipe the hard drive so I can reinstall OS. I thought it may work to connect it to another computer in target disk mode, but the iMac won't recognise me pressing T. Would anyone know whether there is any other way I can wipe the hard drive or otherwise get OS back running?

If your keyboard is a wireless one, wait until the startup chimes sound and then immediately press the appropriate key.
If your keyboard is a non-Apple one, then startup commands may not be embedded. In this case, using an Apple keyboard should work, such as the original one that came with the machine.
The key to hold down to bring up Startup Manager during booting is the Option key, not the Command key.

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