Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Does Not Work

I purchased 2 of the HDMI-F to DVI-M adapters. They do not work with my Macbook Pro and Acer monitor using a mini display port to HDMI adapter and HDMI cable. I purchased a Radio Shack adapter for quite a bit more and everything works fine. These adapters look like the real thing but cause my external display to blink. Also, they are not made by Tripp Lite.