Hello, I just bought a new top of the line 15" 2015 MacBook Pro and I am already having a problem with using a display. My friend uses a MacBook Air in clamshell mode connected via HDMI to an ASUS display. When she touches the keyboard or clicks the mouse, the mac wakes up and sends a picture to the ASUS display and it works fine. I am trying to do the same thing, also with an ASUS display with HDMI, but the display does not behave right. I hit a key on my USB keyboard or click the mouse, and the ASUS monitor wakes up but says "HDMI NO SIGNAL" on a blue screen and goes back to sleep, and then comes back on a second later and says the same thing. After 5 or so times of doing this, the display from the Mac comes through and it works. The difference between me and my friend is that she just uses HDMI but I use a Belkin thunderbolt dock and plug the HDMI into that. If I plug the HDMI right into the port on the MacBook pro, it wakes from sleep properly for the most part, but all the devices on the hub lose power for a split second coming out of or going to sleep even though the hub has AC power. Sorry for this being so long winded. Any ideas? Thanks.