[ALUG] A strange shutdown problem

I recently swapped my computer into a new case - that includes the mainboard, PCI adapters and other peripherals including the hard drive with the existing operating system. The only thing that may have changed is that some PCI adapters *may* be in different slots. If I want the system (Debian) to shutdown it does but the power now won't go off although before the swap it always did. Any ideas? Barry Samuels http://www.beenthere-donethat.org.uk The Unofficial Guide to Great Britain