I have a AMD Radeon HD 6800 Series graphics card which has 2 DVI outputs. I tried to set it up with 2 monitors which both have vga connectors on the end and used 2 dvi to vga adapters like these.

http://www.tvcables.co.uk/images/items/vga-to-dvi.jpg

For some reason nothing would reach the monitor, it would remain in standby, if it was plugged into the second output. I tried all the different combinations of cables, adapters and the 2 monitors but whichever monitor that was plugged into the second output wouldn't work.

I then randomly decided to plug a different monitor into the second output which has a dvi connector on the end so there was no need for an adapter and plugged it in and it worked!

Does anyone know why the second output on the graphics card won't work with a dvi to vga adapter (and the first output will)? I'm really confused!

Thanks