only two things i know/suspect to be damaged by knoppix are a (1) monitor (see this posting http://www.knoppix.net/forum/viewtopic.php?t=10079& ) and a floppydrive. actually the floppydrive was more operator error but... he forced linux to make 1.74M floppies, the floppy never recovered.
the monitor MIGHT have been on its way prior to knoppix but...