HP Pavilion dv7-4285dx dark screen

Hi,
I have a HP Pavilion dv7-4285dx.  It has been working great until I shut down, put it in travel bag, and tried to boot up once I was at my destination.  It gives a black screen, but I can faintly see the screen when I shine a light on it.  I can see the desktop when I attach an external monitor to it.
Could you tell me if my screen has gone bad and needs replacing or is it something else? 
BTW, I am running windows 7, if that makes any difference and the only change that I made, program-wise, is having Carbonite upgrade my machine to their newest version of software. That was done about one week before I had this problem occur.
Thanks in advance for any help with this.
Janis Belcher

i've had a quick look through myself and can't see the backlight either, you may have to purchase an entire LCD unit assembly which is very expensive (605337-001) 
this can be purchased from the link below
http://www.chilternitparts.com/productDetail?PartNumber=605337-001
unless somebody else know the part number for the backlight specifically then this is all i can advise
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    I work on behalf of HP
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    **Click the KUDOS thumb up on the left to say 'Thanks'**
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    I worked on behalf of HP.

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    **Click the KUDOS thumb up on the 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.

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    I worked on behalf of HP.

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    ****Click the White thumb to say thanks****
    ****Please mark Accept As Solution if it solves your problem****
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    Microsoft MVP - Windows Experience

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    This question was solved.
    View Solution.

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    Thanks.
    Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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