Hp ProBook 4540s screen backlight problem

In my hp 4540s Probook laptop sometimes the screen backlight does not turn on. But pictures are there on the screen when i see it from different angles. And external monitors work fine.
This happens when,
the display goes to sleep and come back again later, the backlight does not turn on
starting the computer (when powering up, the backlight is already not there)
(in both the above cases pictures are there on the screen without the light)
When this happens, i can get the backlight by moving a magnet several times near the right speeker of the laptop (where the backlight senser is, as i know).
Any suggession is really appriceted as I am suffering from this problem a lot since it often interrupts my studies.

Hello @Samiyuru,
I understand that your notebook computer is experiencing an issue with the backlight, and I would be happy to guide you towards a resolution!
I am sorry, but to get your issue more exposure, I would suggest posting it in the commercial forums, since this is a commercial product. You can do this at:
http://h30499.www3.hp.com/t5/Notebook-HP-ProBook-EliteBook/bd-p/bsc-274
I hope this helps!
Regards
MechPilot
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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Hi:
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This question was solved.
View Solution.

Ok problem solved. I dont know whether it is related to the installation of HP windows 7 Essential System Updates and Intel MEI driver or not - but I did install these.
What really worked without doubt was this - > install both the fingerprint drivers and then the HP Protect Tools. Once rebooted, open HP Protect tools, then go to administration in the bottom right corner -> Administrative Console ->Increase System security -> tick windows login security and your done. Now you will be able to log in via enrolled fingerprints.

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Please click on the below shown link to troubleshoot this issue
http://tinyurl.com/khbcqxg
1. Please "Turn OFF" the Notebook
2. "Power ON" the Notebook and keep tapping the Escape Key during the start up to enter the Start-up Menu
3. Now here, Please select the BIOS option [F10] and under the Advanced or Diagnostic tab
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Note: Please perform these two tests and post back with the details of any error messages
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OR
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&docname=c01443317
You can also Check your warranty Here to verify the warranty status
Hope this helps, for any further queries reply to the post and feel free to join us again
**Click the KUDOS star on left to say Thanks**
Make it easier for other people to find solutions by marking a Reply 'Accept as Solution' if it solves your problem.
Thank You,
K N R K
Although I am an HP employee, I am speaking for myself and not for HP

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