Problem getting same resolution on dual monitors

There are two identical 19 inch monitors connected to a desktop. One is connected using dvi and the other using vga. One monitor works fine but the other has small resolution and doesn’t have settings for larger. So when I go to display properties settings the largest I can get on one monitor is 1024x768 and there’s no 1280x1024 for some reason. It use to work fine.

when you connect both monitors to the same video card (via a Y-cable or dual ports)
you expect both to use the same resolution.

running one DVI and the other VGA?? Make sure the primary #1 monitor is attached to the
DVI card.

It has an onboared video card and the DVI uses an adapter to a display port.

some systems will not run that configuration - - but you said it did previously so ??

have you check your bios for any video configuration?
Am also surprised that you managed to run a built-in video and a video card.

Yes it use to work
Yes monitors are connected to onboard video card
No I haven't checked the bios settings, what should I look for?