Imac g4 1g 17 " holding cmd key at boot requires password

I want to install tiger on a G4 1g 17" imac
The hd as just been wiped out from another computer by the previous owner
if i let the mac boot without any intervention a folder apers with 2 face on it
holding the c key at boot does nothing
when i try olding the cmd key a lock apears on the screen and ask for a password
Any ideas

Ask the previous owner for the firmware password.
(66526)

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