My Pavilion a6417c The 'power button' light never illuminates. The fans all run at full.

My Pavilion a6417c the 'power button' light never illuminates.  The fans all run at full. The only way to turn it off, is to unplug the Power Cable from the PSU.  The system does not boot.  If the PC is unplug for more than a week, it will boot.  But after 5 minutes it will turn off. 
Eugenio

Try a SMC reset:
http://support.apple.com/kb/ht3964
What does it show in System Profiler (Information)>Hardware >Power>Battery:
This is from mine.
Ciao

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