i can hear start up sound and can see windows logo but the screen is of!!!
if you can just see the image on the screen then your backlight or inverter is dead. Replace the inverter first as replacing the LCD is much more expensive. There is no good way to tell that i know of to determine which one is at fault without specialised equipment. At work we always try another inverter first, they arent very expensive and easy to replace.
its not out of work. the problem is that sometimes it start with off screen, i mean randomly!!!
This topic has been moved from the section Graphics & Displays to section Laptops & Notebooks by Mousemonkey