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You may have your power switch connected to the "Standby Power" pins instead of the Power On/Off pins - some are marked very confusingly. And most power switch circuits are on a four second delay to prevent accidental bumps of the switch from turning off the machine. So you have to press and hold the power switch for about four seconds to actually power down. Some more tips...
Boilerplate-01:
. Common causes of failure to boot (no video, no beeps):
1- RAM, CPU and/or AGP video card not seated properly, or a bent pin.
2- Drive data cable on upside down or only on half the pins or shifted . a pin or two (usually Floppy or Zip drives).
3- CMOS needs to be cleared (AC power must usually be disconnected or attempts to clear CMOS may fail, unless your mobo does not use a power-off CMOS clear) - check your mobo manual for specific info. I always clear the CMOS on new mobo installs - has saved untold hair pulling.
4- On some new mobos there is a CPU protection feature (esp. on Asus/Asrock Athlon/Socket A mobos) that will not allow the system to start if there is no fan (or a fan without a working speed sensor wire) connected to the fan power connector on the mobo (specifically marked "CPU Fan"). If you tried to start your machine without a fan properly connected, you have to attach a proper and working fan and clear the CMOS before it will boot.
.bh.
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