Now, coming to topic. Connected my PC last night and booted it.
It kept on restarting on boot itself.

Let me give you exact details....

Switch on power button-->

PSU is on, fan moving
Cabinet fans moving
MOBO light is on
Initial POST code is 90

Within 3 sec. it changes code to 99 and restarts
In this duration power did not come to my KBD and Mouse (using Razor Cyclosa and they have a blue LED which obviously lights on if power is on)

My guess is
1>the PC is not getting enough power.
Its normal plug point. Should I try a high AMP power soket?

2>The CMOS battery is the culprit.
Any way to check?

3>The PSU itself is gone.
But is was working perfectly even two weeks back!

b/w no beeps were heard though in this whole time.

Any lead guys? I'm at a loss what to look for.