Same thing happened to me just a couple of months ago. Here's how I fixed it:
Go get this rom:
http://forum.xda-developers.com/showthread.php?t=1546970
Recovery:
https://db.tt/Y82XOdb0
Now go into bootloader and select fastboot by pressing the power button, plug in the phone and go to next step
copy the twrprecovery file into your fastboot folder then open a cmd window from fastboot folder, "hold shift and right click then open command window here". now type fastboot flash recovery twrprecovery.img
now unplug phone and press power button once and then select second option down recovery and press power button.
when recovery loads press wipe then advanced wipe and tick ALL of the boxes and then swipe to wipe at the bottom.
plug phone back in and now go back to first screen and press "mount" then press "mount usb storage", now copy the rom, that I told you to download, onto your sdcard, when it is copied press "unmount"
now extract the boot.img from the rom zip on your pc and copy it to your fastboot folder.
in recovery press "reboot" then "bootloader.
now in command window type "fastboot flash boot boot.img" and then "fastboot erase cache". unplug phone and now press power button again and select recovery again.
press "install" and then select the rom that you copied over and swipe at the button to flash it, then reboot.
Any problems reply back.