ok. i just got my nexus 7 replacement today. it was perfect. no defective at all. my last nexus 7, i am not sure if it was actually defective or not. it work fine, but on one day, i was not able to turn it on. On the last nexus 7, i protect it with a smart cover called maybe miko i bought on amazon. it have sleep/wakeup future. I am not sure if the problem was caused by that smart cover or not. in the new nexus 7, I was afraid in using that smart cover again. do you think the smart cover cause the nexus 7 not turn on? should i use that smart cover again? maybe now i use a sleeve. is a sleeve can protect nexus 7 well as the smart cover?