HTC one only boots into recovery
You need to re-flash your recovery in fastboot. Make sure you use the correct recovery for your device and carrier. (I can provide links if needed.) Your rooted so I will assume you have successfully achieved S-Off which requires proper adb drivers and fastboot.


boot to fastboot (hold power + vol down) and connect USB cable
flash nameofrecovery.img (from same directory adb and fastboot are in) by typing


fastboot flash recovery nameofrecovery.img