open the cabinet and see if the cpu fan and other fans are working....if they rnot working then maybe its smps prob
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My first song
http://rapidshare.com/files/128849730/Sachin_-_In_My_Dreams.mp3
http://cid-e2d4f861e716a7fe.skydrive.live.com/self.aspx/.Public/Sachin%20-%20In%20My%20Dreams.mp3
What do you mean by :
(I have connected the cable and the power switch is on).
You connected the smps cable with motherboard while the ups swith was in the on position ?