The GLCD display not working again

The GLCD screen has quit showing data again. It didnt work initally after installation but I reset it a couple of times and it started working. Then all the sudden is quit showing data again and I can not ge tit to work. Just a lit screen with a darker area in the center. just had is installed a couple of weeks. need to figure this out. Any Ideas. All cables are connected properly. Worked for a couple of days.

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