My monitor works fine with HDMI It worked fine with VGA and DVI as well (it has all four, but my current PC doesn't have DVI or VGA outputs). It works fine with Displayport...until I turn it off, and then it won't go back on. I could solve this by connecting the monitor with HDMI, but this is my secondary monitor; my primary is an older but nicer (16:10, brighter, etc) monitor that only has DVI and VGA, while my PC only has DP and HDMI outputs, and the only adapter I've found that works with them is the HDMI-DVI adapter I use, leaving me only DP to connect my secondary.

This is the process I have to go through to get my monitor working after turning it off when connected through displayport:

1. Turn off the computer (I'm not clear if fast shutdown or hibernate has any effect here) 2. Unplug the computer (or switch off the PSU) 3. Press the power button (to speed up the next step slightly) 4. Wait for residual power to drain from the motherboard (30s-3 minutes) 5. Reconnect computer to power 6. Turn PC back on

If I don't fully shut down the computer, such that it reinitializes the displays completely, it never recognizes that there's a monitor attached to displayport. My understanding is that this is because the DID (or equivalent) is powered by the monitor itself, and not by the computer, and when you turn off the monitor (as I do at night to keep the bright-af led off; this also prevents Windows from waking the display every few hours but that can be done by disabling the monitor with Win+P), somewhere between the OS and the motherboard the logical port gets completely shut down until a full reset.