I've just bought my first Raspberry Pi 3.
I will be using with an old VGA monitor and so bought an HDMI to VGA adaptor.
I have installed Raspbian.
When I first installed the OS it worked fine on the monitor I had.
Once setup, I started getting the message
I've plugged into a different monitor and it works fine, with the HDMI to VGA converter, so I know that the hardware is all working fine.not optimum mode recommended mode 1280x1024 60hz
Therefore, I guess it's to do with the config file.
I've tried a number of different suggestions such as
https://thepihut.com/blogs/raspberry-pi ... ga-adapter
but nothing seems to be working.
I want to use a Samtron 73v monitor which is probably 10+ years old.
If anyone can help me to identify the correct config, I'd be really grateful!