Laptop screen not coming on - Acer Aspire 5742Z-4200 Notebook

Try to change the hard drive of your laptop or try to reformat it

Inverter, backlighting, the switch that controls the on/off of the display when the Lid is open or closed. Did you replace the screens? Take a look at this video, it may help you troubleshoot: http://www.youtube.com/watch?v=2Yi6GNFcP3w

please use the following small secret. Disconnect the power adapter from the laptop.
2) Dissasembly the batteries from the laptop.
3) press the power button in ON with the adapter+battery disconnected from the computer. and maintain press the power button by EXACTLY 60 seconds.This liberate the ESD.
4) Try again.
God bless you

try to connect a desktop screen to your laptop and the switch it on ,if the desktop screen is blank then the laptop have a problem , but when the screen go on , then it means your back light of the laptop screen is broken and it can be fix.

Does another screen works on you Laptop?
does you laptop is detecting your screen when you plug it in?

HI there.
Try this things first so that you can check if it is really the screen that's causing the problem,
While the computer is off, press D+POWER button and hold it for 5 secs, different colors should come up,
Make sure the computer turns on. You will know that if the power button lights up. Try to lug in an external monitor and see if display will come up,
If the display comes up, and the d+power did not display anything, might want to call technical support so you can get the screen replaced,
Have a good day!

Check the Wire Harness for the LCD, Remove the Keyboard, and you should find it.

see care fully at ur screen with in some external light
u see somthing check ur laptop to an external monitor
if working?now ur lcd problem

When you say that your laptop "screen is dim", do you mean that there is no light coming from your screen, but you can see images on it? or do you mean that there is light coming from the screen, just a very little amount?

If you can images, but NO light is coming from the screen, then the LCD backlight is dead, and it needs to be replaced.

If there is light coming from the screen, but it's very dim, then you'll need to find the screen brightness adjustment keys on your laptop. This is usually two keys. The first one is normally in the lower left corner of your laptop and should be a different color - like blue or purple, and will be labeled something like "Fn". The second key is normally in the function key row (F1, F2, F3, etc...) and has a symbol on it that looks like a sun or burst of light with an arrow. There's usually one for "brightness UP" and one for "brightness DOWN". Hold down the Fn key, and then press the "Brightness UP" key a few times to see if the screen brightens up. Good luck.

See if you can attach an external monitor to your laptop.If you can and you can see your display on the monitor the it is a faulty laptop screen .If you see nothing on the x monitor then the graphic card/chip is fried.