1. The power switch isn't working.

2. The power switch isn't connected properly. (Usually a thin 2-strand 
wire to a pair of bare pins on the motherboard.)

3. The power supply unit is faulty.

4. The motherboard is faulty.

Pick one of the above.

I don't know about where you are, but over here a new power supply is a 
pretty cheap item, so maybe start with that? (It's also quite simple to 
replace.)

-- 
http://blog.orphi.me.uk/

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