Nexus 7 2012 problem

[Unregistered]

so i had cyanogen mod on my nexus 7 and it wouldn't let me update to the newest version of it so i decided to flash stock using nexus 7 toolkit and now when i try to go into recovery mode or turn it on it says "booting failed" also, i don't remember what build it is running and i can't find out because it won't turn on. Help?