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Mar 16, 2015 7:11 PM in response to curlyredkatyby John Galt,Monoprice's Mini-DP to HDMI adapter is a good choice and should work. It's possible they have had a run of defective adapters. Their customer support is excellent so if the second one failed, you may simply have had two of a bad batch.
What model iMac do you have, and did the adapter fail even when no HDMI cable was connected to it? To determine your model iMac read How to identify iMac models - Apple Support.
Determine either your model or its corresponding model identifier. Examples of each are iMac (21.5-inch, Mid 2014) and iMac14,4.