So what is this "pink recovery sign" it hangs at? I assumed you meant the red triangle on a black background of a regular HTC recovery.
What exactly does happen when you try to access recovery?
With an unlocked bootloader you could use fastboot to do a reset. All a factory reset does is erase the cache and data partitions, so you could use the "fastboot erase <partition>" command to do this. If you can get into the bootloader then just select fastboot mode (if it doesn't boot straight into that mode), connect to your computer and run fastboot on there (since your bootloader is unlocked I assume you already have that set up, since you use fastboot to unlock it).
However, not being able to access recovery suggests there may be something wrong that a reset won't fix. So you may need to reinstall recovery or reflash the device completely (using a RUU, a HTC ROM Upgrade Utility). If you can tell us why you want to reset, i.e. what is wrong, and how it got into this state, it will be easier to advise.
(I'm afraid I'm not going to be online much longer tonight though).