Motherbooard screws

hello,
I have an old system that I'm mounting into a new case (CoolerMaster k350). I had some problems installing the graphics card onto my motherboard because of the case design. I would have to push the motherboard to the right (away from the I/O panel) so that the graphics card could be pushed in all the way. I managed to solve this by screwing the graphics card in before installing the motherboard screws, and then installing the motherboard screws (it was a little tight since the board was pushed to the right a bit, but they screwed in fine). The problem is, now I can't install the mobo screws that go under the graphics card! The rest of the screws are all in place (the top row and bottom row), but the middle row i couldn't install. Would it be ok to leave the mobo like this and not install the middle 3 screws? btw this is an ATX board
Thanks!