Need Help With iMac

I suggest asking the person you bought it from what the passwords are.

 

Where did you buy that Mac?

Btw, that is a Firmware Password you encounter.

"How to maximise your MacRumors troubleshooting experience" created by mad jew in 2006​

A more descriptive and precise thread title will help cater to the right audience and get you more responses. (see rule #3 under Minor Problems)
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Have you also taken a look at MRoogle, since that question may have been asked several times?


Also have a look at the following links, as the information presented there might be helpful in your future endeavours into Mac OS X and could clear up initial confusion and may even prevent harm to your system or your files.

Mac OS X Basics

Switch 101 - guide with articles made by Apple on how to accustom yourself, after you switched to Mac OS X from Windows​

Mac 101 - How to get started with Mac OS X​

Find out how - tutorial videos made by Apple on how to do certain thing in Mac OS X​

Pro tips - tips made available by Apple for easier ways of doing certain tasks​

Mac OS X Keyboard Shortcuts - Learn about common Mac OS X keyboard shortcuts.​

Mac OS X Beginner's Guide by MacRumors - learn about software, media players, shortcuts and some useful tips, tricks and hints​

Mac Guides - tutorials, product guides and more​

Mac Guides - Finding Mac Software​

MRoogle - a very effective tool to search these fora using Google and made available by edesignuk, introductory threads: 1, 2 and 3​

"How to maximise your MacRumors troubleshooting experience" created by mad jew in 2006​

 

http://macosx.com/forums/mac-os-x-s...395-forgot-firmware-password-macbook-pro.html - post number 6 on how to reset the Firmware Password

via forgot firmware password - MR thread
found via MRoogle

 

If the firmware is password locked and is set to prevent boot from CD, I don't think there is a lot you can do.

Even resetting the Windows admin password would require a boot from CD as far as I know.

Unless somebody out there knows how to reset the firmware, I think you will have to wait for the seller to get back to you.

[ Edit: Oh wait see Spinnerlys post above and ignore mine ]