If the OSD controls will not work there is little you can do. A qualified technician may be able to isolate the fault and replace whatever control chip has failed but if it is out of warranty you will probably find purchasing a new monitor more economical than repairing the old.
The information on Computing.Net is the opinions of its users. Such
opinions may not be accurate and they are to be used at your own risk.
Computing.Net cannot verify the validity of the statements made on this
site. Computing.Net and Purch hereby disclaim all responsibility
and liability for the content of Computing.Net and its accuracy.