Argh! Power Manager has wrecked everything!

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http://crunchbanglinux.org – I changed some settings last night on xfce power manager and now my laptop won't bring up any display.  I notice that even the Grub screen doesn't show up.Any ideas?  Should I manually change the settings back using a live session?  If so, what values?  I'm using a Lenovo Thinkpad SL510 (HowTos)