Even with cooling they weren't able to recover. However, a warm reboot, would still work. Speculating, but some laptops might have a way to force a reboot like some machines have a reset button. That'd at least restart the system, although proper BIOS config should prevent that from being useful.
http://www1.cs.fau.de/filepool/projects/coldboot/fares_coldb...
Even with cooling they weren't able to recover. However, a warm reboot, would still work. Speculating, but some laptops might have a way to force a reboot like some machines have a reset button. That'd at least restart the system, although proper BIOS config should prevent that from being useful.