USB mouse doesn't work

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http://www.linuxquestions.org – Slackware 12.x, xorg.conf, fvwm95, generic 3-button scrollmice, both known to be working. USB ports work for various other USB devices -- card readers, portable drives, etc. I can't get behind my machine to disconnect my ps2 mouse (long story -- ps2 mouse was removed once, but USB mouse still didn't work), but I'd like to add a (wireless, if possible, but not necessary) USB mouse. I've been reading and following suggestions in appropriate groups/forums (including this one) for maybe 5 hours now, but I can't get the USB mouse to actually work, although the ps2 mouse continues to work fine. (HowTos)