No problem. Does it boot into hboot or fastboot mode when you restart while pressing the volume down key? My last HTC always started in fastboot mode, which is the one you want if you are to reflash the phone, but the one before would always start in hboot mode (they look very similar, apart from different menu items and the word hboot or fastboot at the top. If it's in hboot and won't switch to fastboot the only thing I can think is to try the same "reboot while pressing volume down" while connected to a computer.
If the bootloader menu doesn't respond and you can't get into either recovery or fastboot mode I agree that you have no options.