Please post some more system information.
Open a terminal (e.g. by typing terminal into spotlight).
Run the system profiler to copy selected system information to the clipboard, by copying the command line below into the terminal and pressing enter:
system_profiler -detailLevel mini SPHardwareDataType SPSoftwareDataType SPDisplaysDataType SPAudioDataType | pbcopy
Now paste the clipboard into a new reply to this post, by pressing Command + V.
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