Not quite. That button could also reset the appliance to its factory default settings. Possibly not what you want.
So study the manual, find the chapter where it tells you how to access it from your computer (either Telnet or HTTP) and read it in order to do a proper reboot. Or just pull the cable.
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.