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Display is nothing but colored lines with a dark mark in the middle. What is the suggested repair thanks

Patty Duguay , It sounds like the LCD is damaged and in need of replacement, this replacement is listed as a difficult repair. Below are links to a replacement guide and to replacement screen, which you can also do a search for better pricing perhaps. If screen is not noticeably cracked try reseating the connectors inside the device first and try. Good luck. I hope this helped you out, if so let me know by pressing the helpful button. Nintendo 3DS XL Upper LCD Display Replacement [linked product missing or disabled: IF258-025-1]