I have four monitors supplied by two identical Nvidia Geforce 210 graphics cards. I don't always have all four switched on, it depends what software I'm running as to whether I need them all or not. Recently one of my monitors, a 1920x1200 Iiyama 2607 has started giving me problems as it wouldn't always come on when I turned it on, but when that happened, if I logged out and back in (or sometimes if I rebooted) it would come on. I noticed that my graphics card started to describe it as a Generic pnp display rather than name it as a Iiyama 2607. All my other monitors are identified/correctly named by the graphics cards, and I think when I first installed it, it also was identified as an Iiyama. All four monitors have been connected digitally (two by DVI, two by HDMI into the graphics card with an HDMI->DVI adaptor into the monitor).
Just recently I've not been able to get any DVI input recognised by my Iiyama. I've tried both graphics cards, both DVI and HDMI sockets. I changed the DVI cable (though both my spare DVI cables are identical and pretty cheap so I can't exclude a problem there). I tried plugging the Iiyama into a different computer DVI socket, still no DVI input. I've done monitor factory resets, no DVI input still.
However, VGA works fine (other than being a high resolution the screen is a bit blurry so I'd like to get a digital signal back if possible).
Is there anything anyone can suggest that I haven't yet tried, to test for the problem or to get a DVI working again on the Iiyama? I read somewhere about EDID getting corrupted when graphics cards say "generic pnp", if that's happened to my Iiyama then can I mend it from my computer without goosing the monitor and stopping the VGA from working too, since that's my last resort if DVI is not working? How would I change the EDID on the monitor if it refuses to recognise any DVI signal?