Nexus 7 dead after using OTG

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http://forum.xda-developers.com – Hello, last night i received my OTG cable. My nexus is rooted with custom kernel so I decided to transfer some files from my usb stick. Everything was fine when i plugged and played some song from flash stick but then i leave it connected for 2 hours and when i come back my nexus was dead.. I tried everything but its always black screen. My friend who gave me this OTG cable told me that micro USB connector of the cable is little shorter than normal. Is this is a problem? What you think is happen? (HowTos)