Imac wont start from sleep

My imac has recently decided not to restart from sleep - I am having to switch off power and restart. Normally it will restart when I left click the mouse, however, there is no light showing on the underside of the mouse - profiler states 91% and the keyboard 100%
When running there appear to be no issues.
Any thoughts please?
3.06Ghz running 10.6.8
8Gig Ram - showing in profiler.

See KB Article:  http://support.apple.com/kb/HT3964 Intel-based Macs: Resetting the System Management Controller (SMC) 

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