My tower will not power "on" I shut-down the

You never plug anything into the expansion slot whilr the computer is turned on and running. This is a sure way of damaging the motherboard.
Turn off the computer and remove the wireless adapter and then boot up your computer, if it still does not boot up then the motherboard most likely been damaged.
I suggest you take it to a computer repair shop to assess the damage and give you a repair quote.

the fan on the CPU working? Try a different power supply the one you have might be faulty

That is a software issue with the OS. Was it always like this? If not, try a system restore to some time in the past when you know the unit was working fine.

The fan on your power supply is shot. Replace your power supply.

Well i recommend you reinstalling windows xp

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- try to remove the battery of the laptop and unplug the power cord
- hold the power button for 20 seconds to drain the remaining power
- turn on the system

Hold the power button down on the actual tower of your computer. After about 10-15 seconds the computer will turn off and you can restart it. If that fails, as a last resort pull the power cable out of the tower. It isn't as damaging to the computer as most people think but should only be used if the computer won't turn off any other way.

Hold the power button in for a few seconds it will shut down. Then unplug system and push the power button down with it unplugged then replug it in and power up again. Then do a proper shut down again to see if the problem fixed. I hope this assisted you. John

Power Light Shuts Off
If the power shuts off during game play (even as much as 30 minutes after the system is turned on), then turns off and won't turn back on or the fan isn't working, the system needs repair.

Power Light Flashes
If the power light flashes once when power button is pressed, then turns off and won't turn back on, the system needs repair