Unkknown Problem..Pls help..

[jassd33p]

hii guys..i am having a very strange problem while starting my Pc..Just hope i wil get a Soon reply...wenevr i switch on my cpu..both the fans..(SMPS..and the one on my processor)both rotate for a while..n den stops..n my computer doesnt starts..after a min..i switch d smps off and then try again..and the same thing happens..after doin this approx 4-5 times..my pc starts...i wonder where and wat the problem is..Pls guys..I need urgent help...and is it necessary to tell the configuration of my system??