princeton synergy 714 dying (dead?)?

I have a 17" princeton LCD (senergy 714) that is just out of warranty when it started failing - the screen would intermittantly fail to synch after being on for awhile. Turning it off and waiting awhile restored it, now it refuses to synch at all. (by "refusing to synch" I mean that the image seems to me to be like when the monitor and the video card aren't communicating correctly and the image breaks up and rolls and such...sorry, I'm not technically saavy enough to describe it better, but it is completely unreadable at this point).

In any case, this happens all the time now, and I swapped monitors, and the new monitor works fine, so it isn't the computer/video card, it is the monitor itself. I can't even get the MENU to display in a readable fashion, so would I be correct in assuming the monitor is probably not workable at all (and not worth fixing - since new ones are around $100 at this point)? I had originally thought maybe I could run it off the DVI input (I'm using the analog VGA now), but I can't directly test that since I don't have easy access to a computer with a dvi output. I was debating getting a new video card with dvi output (since updating my video card on this 3 year old system wouldn't be a bad idea anyway, but I'm thinking now it won't work anyway.

Any thoughts? For me, $100 is a reasonable sum, so if I have to replace it, I will, but I'd prefer not to if there is a workaround. I'm disappointed it only lasted 3 years (and a few months...). but what can you do? thanks!