i got a used sony vaio pcg-f540 and I cant see anything on the screen, Its just black. It powers up, no beep and just sits there. Below the screen i see 2 other lights marked #1 and #2 , #1 flickers orange and #2 has nothing going on with it. I tryed putting in a os disc and booting it up that way , but the screen is still blank, what could it be?? battery? 
