Computer does not start up

[KING_90]

my core i5 board lights on but fan doesn't spin and computer does not start up

please help

 

[McBoss]

Are all of your cables/power cables plugged in?

 

[KING_90]

Are all of your cables/power cables plugged in?

 

[KING_90]

Yes, infact the computer was working the night before. i just shutdown the pc. the next morning i experienced this problem