Startup keys won't work

I'm having issues logging into my intel-based iMac, so I've been trying to boot up in safe mode, as well as boot from my Snow Leopard install dvd. But, whenever I try to boot up using the startup keys (shift for safe bode, option or C key for booting from the install dvd), nothing different happens. It still boots up normally to the login screen. The keyboard works fine, because I can still type in my password.

Use a wired keyboard for the at boot key commands, a PC one works too. Alt/option is the same as Windows/Apple/command key are the same too.
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