Open you box, disconnect and immediately reconnect all connections to all the components inside. If you can get compressed air, blow it clean of dust, if not use a paint brush and brush it as clean as possible.
The memory chip could be the problem with continuous beeping. Remove you chip/chips (RAM) clean the connections with a pencil eraser and replace (Do not touch contacts with your fingers) Turn on and try again.
If this fails, get a bag of concrete mix, mix it, fill the box with concrete, connect a chain and use your PC for an anchor for your boat. LOL..