Absolutely; one of my coworkers went to see a used CLP they saw online, and he told me the whole thing was covered in mold and wouldn't turn on.
The seller then said "ok, another $50 off"
However, if you don't smell any mold? Then quite possibly you could get everything working again by cleaning the contacts. I warn you, this is is not for the faint of heart; the cleaning is easy; the disassembly/reassembly is quite daunting, especially if you accidentally move any of the key sensors (the little rubber strips) out of place, some keys might not work anymore. This even happens with experienced technicians; be *very* careful about misaligning any of the rubber strips under the keys!
Mark