When you say they don't work, do you mean that you booted to open firmware and tried them and they really did nothing, or that you didn't notice Giaguara said "Can you boot to open firmware" to try them, and you tried them in the console and got "reset-nvram: command not found"?
Saying that "they don't work" without any detail doesn't help us help you. What about it didn't work? Did you issue the commands successfully but still couldn't boot to aqua? Were you unable to boot to OF at all? Or was it one of the hundred other ways it could have not worked?
To boot to open firmware you hold down Command-Option-O-F while booting, and you'll get a screen like the console but with tiny font. Try those commands there. Open firmware is vaguely similar to CMOS settings on PCs.