It is a CRT monitor and unless you know what you are doing can be extremely dangerous long after the power has been disconnected from it. If you insist on opening it up then you will need to look for some screws securing the back. There may not be any. The back may simply clip on. Unfortunately, with CRT monitors it isn't worth the expense to have a qualified tech look at them unless you can find one who will give a free appraisal. A new monitor will cost less then the repair bill.
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