Nexus 7 not boot

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http://forum.xda-developers.com – Hi, mam problem z moim Nexus 7. I installed Clemsyn's Elite Kernel, and system has stopped working.Android does not start, it shows only the Nexus logo. I do not have a system backup and do not know how to fix it now tablet. Please help me. I'll send a beer (paypal) :) (HowTos)