Hi all! This Christmas, I have given a Macbook 2015, previously my setup was an iMac and Dell U2515H monitor as the secondary monitor. I've been reading about how to have 2 screens connected to the MBA using the MST port (daisy chain) from dell monitor (daisy chain). Once connected all devices, I've got mirror image from the secondary monitor on the iMac when the target active mode (cmd + f2). The macbook does not detect a third screen, only two screens, mba and dell. If I connect macbook to imac, the imac is detected as secondary monitor, without using the target mode (cmd + f2) This is the configuration: Macbook Air (mini Displayport) -> Dell Monitor (Displayport) Dell monitor (MST Displayport) -> Imac (mini Displayport) Can anyone give me a clue about why this happens? - The imac is the problem? With another monitor will works? - I Use a standar mini displayport cable from the MacBook Air to Dell. Need a Thunderbolt cable? - Will i need other quality cables? Active clabes maybe? Thanks!