crwdns2934241:0crwdne2934241:0 oldturkey03

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astan, connect an external monitor and see if that behaves normal. If so, it is possible that you have a bad display cable or an LCD that is starting to fail. For any disassembly work, download the service manual [http://downloads.dell.com/Manuals/all-products/esuprt_laptop/esuprt_latitude_laptop/latitude-d620_service%20manual_en-us.pdf|from here]

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open