Dear All, just bought this beast in a PC show. However, in addition to its blue light turned on, there is no Acer logo showing up and all control buttons do not work. Linking the display with my macbook pro Mid 2014, which supports 4K monitor, with HDMI fails to have any signal. I pressed the input button. Nothing took place. Just the silent black screen. Even without any connection, when turning on, the screen should show the Acer logo and all control buttons should work, right ? According to my previous experience in using the Acer monitor, it should be the case. Please advise.