How do I change screen brightness and contast on hp omni 120 PC. I have tried in Windows 7 but it refers me to the monitor controls. But I there are no controls on the monitor case. I have phoned hp helpline but was told they would not help as pc is 18 months old and out of G/tee. I need to do this now as I have developed a eye problem.
Thank's
PS. model name hp 120-1220ea desktop. product No B7G5EA.