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I have had a Dell D630 laptop for a long time. Suddenly the graphics card began to over-heat and the screen got a pink color. After a while the monitor didn't show anything.

Right now, when I turn the computer on nothing shows on the screen.

How can I solve this problem? Can I connect an external USB graphics card to replace the onboard graphics card?

enter image description here

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That's not a graphics adapter... It's simply an extender to your current video card – Canadian Luke Jul 9 '11 at 2:20

If you use the USB adapter, there would be no way to get the video to display on the laptop's built in screen. It would work with an external monitor though.

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