HP G72-a50ET screen backlight problem

Hi,
In fact name of my problem is easy: "Screen Backlight Doesn't Work"
While there is no problem I shut down the laptop.
Then next day, when i power on  it again, screen backlight wasnt working.
When I connect my TV by HDMI, there is no problem on the TV MONITOR, every thing is ok.
But laptop's screen no image
I can hardly see in the dark desktop icons,  just only backligth is off.
What can be the reason? What should i do?
(I checked drivers, all are actual)
Model: HP G72-a50ET Notebook PC
Product::   WU900EA
Thanx

I tried your suggestion to solve my problem
and then I applied steps (wich are below) one by one
but at the step 5, wich software program should I chose I dont know
Wich program?
Mrstenter wrote:
Hi @emrejazz ,
Thank you for visiting the HP Support Forums and Welcome. I have read about your HP G72-a50et Notebook having an issue with the screen backlight. I have found that if you run the compatability program it will most times fix this.
Have you checked for any updates?
Hope this helps.
Thanks.
1 Click Start and then click Control Panel.
2 Click Programs, and then click Run programs made for previous versions of Windows.
Figure 1: Programs and Features option
3 Click Next to start the Program Compatibility Troubleshooter wizard.
Figure 2: Program Compatibility wizard
4 The troubleshooter detects any issues and displays a list of older programs.
5 Scroll through the list of software programs, select the software title you want, and then clickNext.
6 Select Try recommended settings to change to the new recommended program settings.
Figure 3: Troubleshooting options
7 Click Start the program to test the old program with the new settings.

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