wait so you can get to the bootloader? from what you described that is a yes. do you see anything in the screen? a menu? from the youtube video it looks like there is another button you push to get to the bootloader menu. did you try that?
this is why i never use a pattern to unlock my phone.and since i do not have your phone, i do not really know how to do a hard reset other then what i have found on the net. you might need to take it in and have your carrier reset the phone for you.