I connected a new display (ASUS VS229-H) to my computer using the DVI-cable which came with the display. I only see "no signal" on screen until the OS log-in screen is loaded. The previous display was connected via DVI too and did not show this problem. The VS229 takes DVI-D, which is what the previous monitor used too. The graphics card is a pretty old Radeon VE but I tried another, newer one showing the same problem.
Searching the web I only found many people having problems with the signal after the windows drivers have loaded (but that's the part that works fine with me) or problems being caused by using an unsuitable cable (But I used the one that came with it, and tried another one as well)
As a little hack I connected the VGA with the card and monitor too, so I can switch after loading but this is cumbersome.