I have a big black box on my screen how do I delete it?

or:I have a big black box on my screen how do I delete it?or:That depends on what equipment, and what operating system, and what program, and what yo

or:I have a big black box on my screen how do I delete it?

or:That depends on what equipment, and what operating system, and what program, and what you mean by \"big black box\". You can't assume that everybody knows what you are talking about, and most problems just need somebody familiar with the system to look and see what's wrong.

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