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Hi,

Your post/description indicates a likely AC hum riding on the video signal. This cold be caused by:

• loose cable/connector;
• faulty capacitor on the unit's power supply regulator circuitry;
• electrical intereference which could be caused by external drives, subwoofers, electronic ballasts of some lamps, any electrical/electronic devices physically near the monitor.

The 2nd possibility would mean that the unit has toi be opened. This of course would require a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings. Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.