External Monitor not Reconized

I have a 27", mid 2011 iMac OSX 10.9.1 and a ViewSonic monitor. I purchased a Thunderbolt to VGA video adapter cable and connected the external monitor. I'm getting nothing. It's not being recognized at all.
I've tried clicking detect display, arrange monitors, I've reset the PRAM. I've even purchased a different cable and that didn't work either. Any suggestions?

Hello meattray,
The following article provides steps that can help get your display working with your iMac.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT1573
Cheers,
Allen

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