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It was working fine and had been for a couple of hours, at the time I was only browsing the web. Then suddenly (all at once) I got blue stripes across the LCD (a WUXGA one (1920x1200)) across the whole screen about every 3rd pixel row. The screen the stopped updating (no mouse movement).hard power off, upon turning on, I could no longer get anything on screen (No BIOS. Nothing. Though HDD LED was flashing).

I have tried using an external screen, the screen received something (because it came out of sleep), but beyond that nothing on either screen.

Assuming this to be a GPU issue Where can I get a replacement Quadro FX 3500m (or suitable replacement) for this laptop?

Dell doesn't have any, and googling around can't find any either.

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Have you tried looking for a "parts machine" on ebay and such? You might find another laptop of the same model that was dropped with a broken screen or some other issue other then the video that you could salvage good parts from. You might not be able to find just the GPU, but you might have a better chance at getting another same model laptop with different broken parts with a good motherboard and GPU.

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Yes. Unfortunately, all on ebay are either fully working (with lower spec GPU) or just Motherboards with no extras (cpu/gpu) –  Ali Lown Aug 31 '10 at 21:39
    
Dell told you they could not get you the part even at their premium OEM part costs? –  Troggy Aug 31 '10 at 22:07
    
No, I was looking at their parts listed online (for example a new MB for only $300 more than anybody else). –  Ali Lown Aug 31 '10 at 22:10
    
ebay.com seems the only option. There are a few on there, but in most cases it would be cheaper to get a new laptop! –  Ali Lown Sep 1 '10 at 12:41
    
@Ali Unfortunately, that is the case many times with most used laptops and a single major part failure. Many cases just end up being cheaper to not only buy another laptop, but upgrade at the same time. –  Troggy Sep 2 '10 at 8:47
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