Please make sure you're flashing to recovery, not boot.
Originally Posted by RaskloP
I fall under category D (ROM is stock, bootloader unlocked, CWM recovery and rooted)
Can someone tell me in detail how to
Do I boot into CWM?
Thanks for your help.
Connect your phone to your computer via USB. I'll assume you have the necessary bootloader/adb drivers installed.
Open up a command prompt to wherever your recovery.img is and type (this assumes you can easily access adb/fastboot from anywhere):
adb reboot bootloader
Phone should reboot into fastboot. From there type:
fastboot flash recovery
It should then flash the stock recovery.
I would recommend taking a look at the HTC All-in-One ToolKit in the Development forums. It might simplify it for you.