2013 Macbook Pro connect to LG monitor

I have hooked up an HDMI cable and the Kanex adapter into my Thunderbolt port. When I plug it in the screen on my laptop goes blank for a few seconds and then comes back on normal. Nothing happens on the LG monitor. In Preferences>Displays> I have no button for Arrangements, just Display and Color. Airplay Mirroring says "no devices detected". And "Show mirroring options in the menu bar when available" is checked. I don't know where to go from here. Any suggestions?

Hello smudge1239,
Thank you for all the information you provided about what is going on. It sounds like nothing is appearing on your external display.
I found an article with steps to troubleshoot issues with displays. This article is for internal and external displays, so you can skip any steps referring to the internal display. I recommend reviewing the section titled "No video or no signal, image distortion, 'snow,' or flickering" in the article below. I recommend reviewing the full article, but the following steps specifically stands out to me for the situation you are experiencing:
Reset the system
You can reset the Mac's parameter RAM and SMC.
You can find the full article here:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Thank you for posting in the Apple Support Communities.
Best,
Sheila M.

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Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
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Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1600 MHz, 0x02FE, 0x000000000000000000000000000000000000

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After searching forums and the web for days I still have not found an answer so here by an independent post:
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