Laptop display not working unless DVI cable is plugged in

Posted by marien on Super User See other posts from Super User or by marien
Published on 2012-11-19T22:20:27Z Indexed on 2012/11/20 17:04 UTC
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laptop

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boot

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video

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thinkpad

I have a Lenovo ThinkPad T420 with an i5 processor and integrated graphics. I dropped the laptop and now the screen is not working. I replaced the screen and it is still not working. It shows the BIOS and then at Windows login the screen gets all static looking. But if I plug in a DVI-to-HDMI cable the laptop starts and works fine. Even the external display works and the laptop display works too. As soon as I unplug the cable the screen crashes and is all static.

I cannot figure out the problem. The video works because the external screen still works. How can I fix this?

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