PC Power Up only after cmos is reset

Hello friends,

Im facing this problem for my pc from few days. It wont power up at all. I checked all the voltages and they are fine. Motherboard LED is also off. I removed all the cables and place them back after cleaning everything.Still no luck.
I tried using paperclip instead of power switch,still no luck.

This pc takes the power only after i remove and reinstall CMOS battery . (Jumper clear wont work). This works well few days,and again i need to remove CMOS battery.

So i was guessing, what is the relation between the cmos battery and Motherboard not getting power from PSU ?

MB- ASUS a8r-mvp
Pro-AMD
PSU-450 watt
RAM-Kingston 4GB

regards