xrgb2+ and vga monitor problems

After playing for several hours, the monitor shuts off and makes this whirring noise like its trying to display an image but can't.

I had a space heater in my room, so the room was probably around 80 degrees and monitor was very hot when it shut off.

If I unplug everything for an hour or so, I am able to use the monitor again.

The monitor is a 21" hitachi HM-4721-D. Instead of having a cable running out of the back of it, it has individual plugs for rgb ground and sync in the back.

I've had the monitor for a year or two, however, I think the model is from 1996.

I've used a newer, smaller monitor with the xrgb2+ and had no problems. I think the problem may be with the monitor, not the xrgb2+.

Thanks in advance for all of your help!

Does this only happen with the XRGB?

Try it with a PC or DC.

I plugged it into my PC and it worked fine, but I didn't have in plugged in for a long period of time.

I think I'll try that now.

Thanks!