Hello Sujatha K,
Thanks a lot for your reply. I tried the following:
1. As my battery was pretty much drained I removed the battery, pressed the power on button for over 30 seconds and then connected to AC Adapter and let it sit for about 30 + seconds. After this pressed the Fn key and power on button. I do see the LED lights and hear beeps perfectly fine. After about 7 or 8 minutes (saw Red, Blue, Green and think White screens during this process) saw a screen which said Graphic test timed out and first time I pressed Y to continue further . At the end the system rebooted and went to my windows desktop too eventually loosing out on the image (started becoming grainy and then it was just lines)
2. Same test like above but this time I pressed R to retry during the test and in fact saw the color bars too but on restart saw no images.
3. Tried to repeat a third time but this time just hearing the beeps repeatedly even after about 20 mins, not seeing diagnostic screen.
Not sure what more to try.
Thanks a lot