Hi suny100,
If you have VBA code behind your workbook and the code is faulty, it can give this problem. For example, if your code does an
this could make your workbook not work. You might also have other VBA code that is turning the Screen off. If an error happens in the code and these normal things aren't turned on you would be stuck.
I'd suggest you close your workbook and open the copy of it or an older version and see what the VBA code is doing and find where these things are going bad.
Without seeing your code or understanding your problem better, the above is simply a guess.
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