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Re: no signal report
Ensure that your "video output" on the laptop is on. You usually have to press the Function key (FN) and one of the "F" keys (F1,F2,F3,F4, etc..), The one with a little monitor icon on it. This will toggle the video between the lcd and the TV.
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Black screen - no flashing white cursor in the upper left corner - no picture at all, i.e. the initial Dell start-up screen doesn't show up either:
- LCD is dead or isn't getting a signal - not an easy fix; or
- the LCD isn't being sent a signal - holding down the function [Fn] key and press display Function key to toggle through its settings (LCD panel only, Rear VGA output only, both LCD and VGA output)
Black screen - flashing white cursor in the upper left corner - the screen goes black after the windows loading screens come up but before the windows login screen comes up - it is probably a windows video driver problem. Try starting in Windows Safe Mode with VGA. Press [F8] after the Dell startup screen disappears to access the windows startup menu
This is a common problem with many LCD monitors. The printed circuit board that provides a stable voltage for the monitor to operate from starts to fail. The PCB can be replaced, when/if they are available, or repaired in most cases at a much lower cost. for more information on this email me at [email protected]
Have you tried pluging in the monitor in to the laptop before even starting the computer or Putting the computer in to "Stand by" then pluging in the monitor and then bringing the laptop out of "Stand by" or yet when you do have the computer on with the monitor pluged in, try "Fn" and a button hat has like two screens on it with a small bar in between them? All these should work.
First of all, you have to check whether you can see video signal with surrounding light tilting the screen.
If you can see dim image, all you have to do is replace back-light inverter or fix it. Usually, the fuse is open and you can connect it by simple soldering.
If you can't see dim image, it is another problems.
Give it a try.
This sounds like a contact has been lost to the back light of the LCD screen. You could try to open it to see if there is any loose connector. You can get some info from Gateway how to take it apart a bit. To avoid risks you do better to bring it to a technician.