I need to install Snow Leopard onto partition on OS Lion iMac but it keeps beeping after pressing/holding 'C' to start installation.

Hi All,
I bought a used iMac (2011 model, Lion OS X) and I need to install OS Snow Leopard onto a partition I have already created.
I have tried rebooting from the SL installation disk which does not work as the computer only beeps at me (beeps 3x then pause, beeps 3x then pause, etc) whilst showing the white screen with apple logo. I then have had to 'force quit' out of the computer to shut it down to stop the beeping.
I've tried holding down 'C' whilst restarting the computer to bring up the start up disk options & it beeps again in the same screen. 
I've read through many threads in forums to try to find a solution but have been unsuccessful in doing so.
Please someone help me?
Thank you in advance,
Gina

Your RAM may not be passing a check.
http://support.apple.com/kb/HT5860?viewlocale=en_US
Try running a memory test.
Memory Test
Memory Test (2)
You can also try holding down the option/alt key during a restart, select the disk there, and see if it will boot.

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