My HP Pavillion dv6-1113us has gone into sleep mode and refuses to wake up. The screen is black, no activity in the hard disk, all the LED lights above the keyboard (power button, volume control buttons, stop, play, FF, Rew buttons as well as the wi-fi signal light) are all lighted up, however the light above scroll ock and next to CAPS lock keep flashing, simultaneously.
I tried hard booting, it has not worked. I tried inserting a CD, could hear the CD drive working but nothing happened after that.
This problem had happened earlier when a technician took it and returned in working condition saying that he changed the graphic card. At that time it was running Vista. However, now it has Windows 7 Professional.
Don't know what to do now and would appreciate all help/suggestions to get it back - alive!