One row of keys has stopped working.   System was fine last night, sent it to sleep as usual. When I woke it up this morning, the keys were dead. I made no changes to the system at all recently (new installs, font changes, etc.).

The keys that no longer work are on the lower row, from Z~/ (plus the left-most Command key and the space bar on the bottom row).  System is iMac (Intel), about five years old, running 10.5.8 (happily), with a wired keyboard (with number pad). 
Solutions tried (all without fixing the problem):
- change to another keyboard
- change keyboard(s) to another USB port
- reset SMC (twice)
- reset PRAM (twice)
- switch to another User Account
Kind of running out of ideas ...  Anybody have any suggestions?

Other things tried:
- checked all the options in Universal Access, to make sure none of the 'Sticky Keys' etc. were activated
- booted from the Install disc ... still no go. Even then, the same keys don't work.
Looks very much like a major hardware fault, I guess ...

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