Just to let you know, you don't have to use that reset button... All electronic devices, including the X3, always should have a forced shutdown option by holding the power button anywhere from 10 to 30 seconds. In fact, in the X3 manual, it states you can hold the power button down for 10 seconds for forced shutdown.
This works even when frozen, because it is a hardware-based shutoff.
Also, for anyone who has a PS3, this works for them too. Don't just unplug your system. That's how corruption happens. It is safer to hold power buttons down than to cut the power entirely.