like many other users here, I got a lot of trouble connecting my pi to external monitors. It connects flawlessly via HDMI to my TV. However, it does not work with my two DVI-D input monitors. I tried every possible combination configuration of the /boot/config.txt but still they won't work.
I am connection through a HDMI->DVI (24+5!) adapter. Could this be the problem? I guess 24+5 means DVI-I Dual-Link which should be working fine with my DVI-D Single-Link cable when it is connected to a DVI-Output. But does it also work when the original output is HDMI? So would buying a dedicated HDMI->DVI-D do the job?