Screen Contrast Too Bright - Changed Itself

My mother-in-laws AIO computer monitor is too bright. The contrast changed automatically. No updates were done. I ran diagnostics, changed monitor settings, reset defaults. Nothing is changing the end result. Is the monitor just dying? It's an all-in-one. It is less than three years old and not used very hard. What else can I try to troubleshoot? I was going to hook up a second monitor, but b/c it is a AIO I don't believe it has a cable to plug in a 2nd monitor.

This is weird. All I did was squeeze the case near just at the top of the LCD display and the lit screen SUDDENLY had the written display again. As I said the ipod worked but I did not have a written display. With that little trick the ipod returned to normal. About a week later , the ipod had a relapse and squeezing the case dont remembe whether it was the left or right side, brought it back to life and it has behaved itself for the past 3 months. I hope this information is useful to others with the same problem who do exist.
Ted

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