[dba-Tech] Monitor on the fritz - but not actually

Dear list:
 
I got a new flat screen for a machine a couple days ago.  Working fine for a
few days.  This morning, won't display and shows a message "Out of Range".  
 
So I plug in the old CRT.  It works.  

I plug the new flat screen into my laptop.  It works.
 
I plug the new flat screen into another computer.  It works.
 
I take an older flat screen plug it into the computer that's not working.
It works but displays a box in red that says "signal out of range".
 
All the display setting are the same.  The box that's not working is my
son's.  But I don't think he changed anything.
 
Could the video board have gone bad?  Is that what it sounds like?  Or maybe
firmware?  Or a change in the operating system? 
 
What would you do?  Delete and reinstall the drivers? (The flat screen came
with no CD so I assume the drivers are video board level.)  (Like I know
what the hell I'm talking about.)
 
Anyone know what 'Out of Range' might mean?
 
Any advice appreciated.