Reinstalling OSX Problems After Erasing HD

Hi all,
I'm in a tricky situation- I am preparing to sell my 2010 iMac (A1311) and so I have securely erased my hard drive using a 10.6 install disk. I was running Mavericks before erasing, but I didn't want my Apple ID associated with the computer when I sold it so I wanted to install 10.6. The computer worked perfectly before erasing, and the erasing process was smooth and with no problems.
Then I tried to restart the computer so I could install 10.6 on my newly formatted HD. However, after I hold the "option" key down when powering up and select the 10.6 Install Disk as my one and only boot-up option, I get stuck on the grey screen with the dark grey apple logo. I've tried several keyboard as well as an external disk drive and I'm getting the same results.
What could the problem be and how should I fix it? I can't access Disk Utilities because I can't get past the grey screen.
Again, I'm a little stumped because the iMac has no hardware problems and the disk worked perfectly on another machine earlier in the day.
Thanks!

What you tried should have worked and the disk is loading if you can see it with the option key held down. Try restarting while holding down the C key.
Selling old Mac
Selling old Mac (2)
Selling old Mac (3)
Selling old Mac (4) Apple support

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