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It sounds to me that you have the resolution on the wrong setting. Go a a clear space on your desktop, right click, and select properties. When that opens go to the settings tab and change the screen resolution to 1600 X 1200. This is the native setting for the monitor. If that doesn't fix the problem continue changing the screen resolution until you get one that works.
dear i think there is a fault in your moniter cable means the two cables red and green is broke down or damage inside the plastic cotted wire.sometime when u move the wire the broken ends of the cable meets and u get clear result but when they disconnect u get blue screen
This is not quite clear.
You say no image at home or at school
but worked at the store
Did you see it working at the store?
Check the cord sonnector for bent pins and or replace the cord- then come back