Things got worst. I installed windows 7 and attached it to the hard drive connector. But still the same result. I got very sad so I just opened the ram cover. And just touched the side of the ram and closed the cover. When i switched on the laptop, now i dont get display even in the external monitor. The lights near the caps lock and scroll lock blink three times continuously then a pause, three times then pause it continuous. And when I press the power button it is not switching off, before it used to switch off.