Hello and at the start sorry for my bad engl

First my graphic card is Sapphire Radeon HD 6670
Now my problem comes with dvi and hdmi inputs
My graphic card seems to only work with the vga but when i try connect my pc with dvi(etc.) cable it won't work it will just be very loud
Also to notice i tryed 2 cables and after using them on my pc they seemed to not work (on 2 pc)
The dvi cable i used is Dvi-vga (vga cuz my monitor is only for vga)
If anyone can help i would be really happy to again set my 2 monitors