I got a monitor with DVI-D and DisplayPort, and I have a a notebook and a graphics card I want to connect to it. The graphics card has DVI-D output, so that's the simple part. But the notebook has HDMI only. How do you connect HDMI to DisplayPort? I only found adapters for the other way round, which are also fairly expensive (i.e. DP->HDMI.) Or should I get a HDMI to DVI and then a DVI-Y-cable to connect everything via DVI?
An HDMI to DVI adapter would be more natural as the two connections carry the same video signals. Don't try to save $2 and get the wrong one. The one I linked to will work for all current HDMI to DVI connections.
DVI and HDMI carry the same signal, DisplayPort and HDMI do not. Every DVI connection can be passively converted (i.e. using an adapter, not a converter) to HDMI. DisplayPort can only be passively converted (i.e. using an adapter) to HDMI if the DisplayPort in question is designed for "dual mode", otherwise an active converter box will be needed.