When i put power plug in my pc fan turns on

I Un Plugged Every Thing
To Clean My Pc And Put It Back Together

I Plugged Fan in The Hd led power led and power switch and reset switch etc

and now when i plug power plug
in the psu

the fan comes on and when press the power button nothing comes on the monitor

does any one know how i can fix thiss !
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More about when power plug turns
  1. Please Help Me This Happens!

    I get the following:
    cpu cooling fan running
    hdd heard to be running
    cd/dvd devices operational
    no picture on screen
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