No led backlight

Hi I have a Compaq presario CQ57 wiith a screen so dark it cannot be seen without a bright light shone at it.
its model no: CQ57-426SA
I have it plugged into an external monitor and thats fine, desktop duplicated on both screens.
I have updated the drivers & bios using hp tool,
I have bought a new led backlit screen & cable, wasting just shy of £85,
this has all achieved nothing, I still have a black screen on the laptop.
It starts up fine, no beeps, runs great no hiccups except that I have to have an external monitor plugged in to see anything!
this is driving me bonkers,
anyone have any suggestions ? (other than bin it)
I would be pulling my hair out, but I`ve none left.......

Hi thanks for your reply,
There isn`t anything in the list that made any difference (its a laptop screen with backlight failure)((LED))
I have tried to change settings, update drivers, nothing makes a difference.
I note this seems to be a common fault with HP/Compaq laptops, there are many references found by google but so far no solutions.
I`m now stuck with a laptop that thinks its a desktop... It will only display on an external monitor.
Iv`e spent hours on this along with a new 15.6" screen & cable. All to no avail. As you can guess I`m regretting buying it in the first place,
Is there a possibility of this being repaired for less than half the cost of a new laptop?

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Message Edited by bjamesw on 12-29-2008 04:11 PM

bjamesw wrote:
I'm astonished. Has all of this been covered already in posts I haven't found? This would seem to be a pretty important topic to anyone interested in thinkpads and it's generated utter silence?
It's the holiday season - forum traffic is down all over, not just here.
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Jane
2015 X1 Carbon, ThinkPad Slate, T410s, X301, X200 Tablet, T60p, HP TouchPad, iPad Air 2, iPhone 5S, IdeaTab A2107A, Yoga Tablet, Yoga 3 Pro
I am not a Lenovo Employee.
I AM one of those crazy ThinkPad zealots!
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Re:do you know how to switch on the led backlight

how do i switch on the led backlight for X201

Welcome to the forum!
One doesn't switch the backlight - be it LED or CCFL - on and off, unless the setup in Power Manager is such that Fn+F3 shuts it off.
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In daily use: R60F, R500F, T61, T410
Collecting dust: T60
Enjoying retirement: A31p, T42p,
Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W
Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.

Monitor LED backlight question?

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I hope that someone can help clarify something (I did perform a search, though without any luck).
Here is the issue:
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Yes, that's what I think too, thanks.
But I am having trouble to get reliable information.
The PSREF doc does not list all the models (or retailers make references up?!).
As for the "Product and Parts Details" page (which one can look up at http://support.lenovo.com/en_US/product-and-parts/detail.page?DocID=PD004392 for the x2xx series), it does provide information for groups of model (i.e. all models starting with 1234-Axx) but not (always) for precise models.
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7458-G37: does not have LED-Backlight according to the a.m. official Lenovo link
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7458-G42: nor this one!
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Who is right? Lenovo or the shops I might order from?
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