Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Dead on arrival

I had never heard of Crucial before this purchase, and now I know why. Despite trying it about four times, my new Mac Mini would not boot up with this memory installed. The Mac would boot just fine with the factory memory, but the Crucial chips: nada. Swapping back to the factory memory, it works. Back to the Crucial, nothing.My Mac is now running sweetly with the factory memory. This Crucial stuff is back in its box, waiting for a return.--- Follow-up ---I returned my memory for a full refund, and had the refund inside a week. So I have to give Crucial credit for customer service. Still can't recommend the product, though.