Laptop problem - screen or graphics card

Hello there, my sister has a problem with her laptop that I'm having trouble getting my head around. She told me last week that the screen on her laptop had started going black unexpectedly, not having the thing with me I thought maybe it was just going into standby but she says it goes black randomly, sometimes whilst in use. I then thought it may be a screen problem (backlight etc) as she then told me that when it went black she could still see the display if she looked at it in good light. This screamed backlight problem until I got here to plug it into an external monitor and the same thing happened.
Since I last spoke to her the problem seems to have gotten worse, she says the screen flickers on and off, sometimes staying on sometimes not. It used to come back on by pressing the power button but this no longer works either.
I'm a bit stuck as to whether its screen or graphics card related now, any ideas anyone? The laptop is an hp pavilion dv6552ea.

You can tell screen problems from graphics card problems by hooking the computer to an external monitor. If the problem is the same on an external monitor, then the problem is the video card. If not, it is the screen. Since the problem shows up on the external monitor it is the video card which is par for the course on that series of models with AMD CPU and nVidia graphics.

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@Enegue ,
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{------------ Please click the "White Kudos" Thumbs Up to say THANKS for helping.
Please click the "Accept As Solution" on my post, if my assistance has solved your issue. ------------V
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Quote from: blazing storm on 04-August-05, 17:54:18
In your motherboard manual it describes how to re-set the CMOS. Taking out the battery would work but it's easier to re-set the CMOS via the jumper pins. It also holds info on bios features and settings in the manual so you might want to scan through that and see if there's anything you might change.
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Ok - I now found out which jumpers to change - thank you.
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On Sunday someone is going to switch ram chips (his are good in his machine) with me and hopefully we'll establish whether or not my physical ram modules are ok.
Seem very strange to me that both of my modules (one was ok a month ago and the other just arrived from Crucial) fail the same test - memtest #7 - random memory but then I'm only an egg when it comes to this stuff.
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Well I don't know if it's good news or bad news !?
Have just tested my system with a known to be good ram module and ?
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http://nsm04.casimages.com/img/2010/09/22/100922123519210586795529.png
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Message was edited by: fredo0411

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Laptop problem - screen or graphics card

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