Reinstalling Snow Leopard after Mountain Lion! Firmware issue!!

Greetings!
I have a Mid 2011 iMac - which I wish too sell so I can get the new iMac when they are released.
Originaly my iMac came with SL, which I have the factory reinstall dvd.
Over time, I have upgraded the OS from SL to Lion, then ML. Which I purchessed via the App Store under my iTunes account.
Now I wish to sell my iMac, I have tried doing a format and install of SL using my original SL disc. But when I try to install, I get the bleeping sound.
I can format and  installed ML via wifi download, but naturaly that requires my appleID, so thats no go for selling my iMac to someone. 
One thory is that I did an offical apple firmware update on my iMac, I can't remember which one, Bluetooth, Firewire, wifi, I don't really remember. But I think that is stopping me from installing SL again.
Any help would be great.

Thanks for the reply, I will try that tonight.
I'm working on this thory I found on google....
'Booting a new MacBook Pro (Late 2011) from a retail 10.6.3 disc resulted in a black screen and a repeating 3 beep pattern. This is due to missing Sandy Bridge drivers. Apple will ship a 10.6.6 (iMac) or 10.6.7 (MacBook Pro) installer disc'
My OS was the 10.6.3 that came with my iMac. I phoned Apple, they wanted me to pay £18 for 10.6.6
Hmmmmmm!

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