Looks like you install a i5-7xx or i7 processor on a H55 board, there in no onboard graphics on a H55 board, the VGA/DVI port is only for i5-6xx or i3 processors due to these processors have an integrated graphics.
So 2 options:
1. Buy a external graphics card, or
2. Buy a i5-6xx or i3 processor
Is the a motherboard for i7 that can still have onboard graphics even if the i7 processor installed does not include support for Intel® Graphics Technology?