1.0 link Rainbow Dash Network http://rainbowdash.net/ Bit Shift (bitshift) http://rainbowdash.net/bitshift http://rainbowdash.net/notice/2027141 @<span class="vcard"><a href="http://rainbowdash.net/user/7875" class="url" title="Omni"><span class="fn nickname">omni</span></a></span> The CMOS battery is what provides the very minimal amount of power to run the memory that stores the BIOS password (and also the internal clock, so that'd reset too), so popping it out and back in again causes the BIOS to effectively forget the password.