if you have a maint set, you can try the diff spree codes
111, 121, 131...etc
does CTRL PDT pop up with a login?
i know it sounds silly, but re-seat the 3 port SDI cable?
change the dip switch to a lower baud rate on the SSC,
reload should have fixed messed up port issue....
make sure nothing is plugged into the SDI ports except your Ltop.
if nothing else works, i would try another SSC (and move over the Security dongle and daugtherboards, should not have to reinstall at this point) or reload the software (if you have software and a backup and keycodes! patches....messy)
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