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Dell GHN (Get Help Now) chat technical support must verify the ownership and warranty status. Click the blue "Get Help Now" on the right to start a private live chat session. Share the private Service Tag with them. Once verified still in warranty, they will troubleshoot with you.

If already out of warranty, state out here the specific model and when the warranty expired.

If the system is in warranty, call Dell for repair.  If it's out of warranty, you can either contact Dell for a repair cost estimate or a local computer repair shop.  The display panel (or assembly if it's a touchscreen) needs to be replaced.