samsung 720n monitor, brightness adust keeps popping up and adjusts brightness to maximum
Make: samsungModel: syncmaster 720n
connected to a different computer same problem
That's a STUCK BUTTON on your computer monitor.
Press and release all the front panel buttons one by one. You may find find one that FEELS sticky.
If it is sticky, you can take 70% to 90% alcohol and dip a toothbrush in it and scrub the sticky switch or switches, WITH the power cord disconnected.
That should work, but if it doesn't, then the Brightness up button needs replaced because it has failed.
30 Years experience. Authorized Warranty servicer.