Compaq CQ-139WM sudden death!!

I bought the Compaq CQ-139WM one month ago. thought it's great deal. it works fine.

Last night, i was reading news on line. it went dead on me all of blue. like losing power type of shut down. really fast, everything went down within a second. AND , won't be turned on. only the external power light flash when pushing the start button to turn it on. nothing else going on. no screen response, no harddrive light flashing ..
I didn't install any new software or was playing video game.

Don't what's going on. i tried to take off the battery and put it back ..tried only using dc adptor.. none of those worked..

please help!!!