This article explains what to do if you believe a power cable is misssing from your Elo Open Frame touch monitor

Power supplies and power cables are not included in the box with the majority of Elo's Open Frame Monitors. This passes the cost savings on to our Kiosk customers who already have existing power supplies.

A list of Open Frame monitors and their perspective power adapters can be found here. 

If you need a power supply for your Open Frame monitor, please visit the Open Frame Product page and click on the link to your particular model. Then scroll down to Accessories and you will find the part number listed for the corresponding power supply and cable for your product.

You can also visit elotouch.com and perform a search for your monitor's part number (EXXXXX) to see fitting power sources/cables.