[COLUG] changing console resolution on Linux server: What are sync frequencies?

[jep200404]

Brian Miller wrote:

> Over the last several months we have replaced the KVM's in our server
> room.  We now have one Linux server where the console (non-GUI) will
> not display on the new video display.  We receive an error of
> "resolution is too high".  When we connect a regular monitor to the
> system, the console shows up just fine, although the text is small
> enough that I could easily say that the resolution is perhaps
> 1280x1024.

What are the horizontal and vertical sync frequencies? 
Most recent monitors will tell you.