Problem with GRUB

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http://crunchbanglinux.org – I recently installed Waldorf onto an external hard drive to check it out, but now when I try to boot into Statler without my external hard drive plugged in I get this:GRUB loading Welcome to GRUB! error: no such device: 48686a0e-7d74-4bb9-b0cb-fe293d89b75e. Entering rescue mode... grub rescue>_I've tried this thread :http://crunchbanglinux.org/forums/topic … -via-grub/and this one:http://crunchbanglinux.org/forums/topic … br-grub-2/but none of them worked. If I have my external drive plugged in grub works perfectly with my Waldorf install as default. If someone could help me (HowTos)