VanguardLH wrote in :

Boris wrote:

I have lots of LCDs now.

Does the monitor have input select? That is, does the monitor have
VGA, DVI, and HDMI inputs?

Just 15 DBA pin VGA.

If so, have you tried using the monitor's control
to switch between inputs to see if it detects an active signal on one
of them?

Did you do any customization in the LCD you are using now? If so,
does it have a reset (back to factory-time defaults)?

No and No.


Can you test with a different LCD monitor on the problematic computer?

I have done that, with no luck. Same problem on ANY monitor.