The very next thing for you to do is to check whether this monitor is even functional. Your post, as presented, is unclear about that (regardless of the Safe Mode statement). It would be best if you could discern between "picture" and "signal".
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 Compnet Ventures, LLC hereby disclaim all responsibility
and liability for the content of Computing.Net and its accuracy.