After upgrading to macOS Monterey on my Macbook Pro, my external monitor no longer works and no longer shows up in displays. The screen flickers, turns black and repeats this pattern. Very difficult to work without two screens. On phone with Apple for about two hours and was told Apple has no resolution. I am sorry I upgraded. I only did so because my Macbook Pro not syncing with messages on iphone. Apple told me I needed to upgrade after being on phone with them an additional two hours for this problem which is not resolved. Now I have two issues. Very frustrating.
DeborahB
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