Default Blue Screen and Phone Reset

Hi,

After I rooted my device and install CWM, my phone encounter this issue.

After I turn it ON, it will stay for about 2~3 minutes and after that, screen going blue and suddenly auto restart.
This keep repeating until battery run out.

Any idea whats going on & how to settle this?

btw, i'm using method from this thread to rooted my device.
http://forum.xda-developers.com/show....php?t=2494471