#HDMI NOT WORKING MAC RETINA PRO#
#HDMI NOT WORKING MAC RETINA SERIES#

If you still get the dim image, you have a screen backlight problem. If you can see a dim image, press the screen “brightness up” button on the keyboard a few times to increase the screen brightness. If you don’t see anything on the screen, shine a flashlight through the Apple logo on the back of your screen. Your Mac has already started to turn on but somehow got stuck somewhere. Do you hear any noise from the fan, mechanical hard drive or super drive? Do you feel any air coming from the vent holes? If you hear the noise or feel the air movement, your Mac is on and your Mac has a logic board problem. Pick up the MacBook place the vent holes (between the two screen hinges) near your ear. This is not good news as the screen is one of the most expensive components next to the Apple logic board. If you don’t see anything on the screen, your Mac most likely has a screen problem. Wait 1 or 2 minutes to check if there is any display on the screen, even a quick flashlight. Therefore, it is vital to double-check any signs of power including sounds and lights to avoid a misdiagnosis.ĭo you hear a startup chime? If you do, your MacBook is already on. But that is not always the case! Your Mac may be ON already only the screen is not working. When you see nothing on the screen, you may think that your Mac won’t turn on. If your Mac still won’t turn on, or if you don’t have a light on the MagSafe connector, go on to the next step. You may try another charger if you don’t have a light on the connector.Īfter 5 minutes, press the power button to see if your MacBook can turn on. The SMC has successfully communicated with your charger and then turned on the light. If you can see a green or orange light on the MagSafe connector, it means both your charger and the SMC in your MacBook are working now. Let your charger top up the battery above the minimum level. However, there are some models of MacBooks that require a minimum battery power before the Mac can turn on.

#HDMI NOT WORKING MAC RETINA PRO#

If the flat battery causes your MacBook Air or MacBook Pro not turning on, most Macs will power on automatically if you connect a working charger. If possible, try to use the original power adapter that came with your Mac. Use the correct power adapter for your MacBook model to charge the MacBook for about 5 minutes.

If you’re unsure about the outlet, test it with a lamp or a mobile phone charger. Check if the power cable is undamaged and securely plugged into your Mac and a working electrical outlet. You need to make sure your MacBook is receiving power from either the MagSafe or USB-C charger.

If the SMC has not received power, failed to function, or failed to create the required “mini power supplies”, your MacBook won’t turn on.įor deeper technical details of the MacBook power-on process, see our article How does my MacBook power on? These “mini power supplies” will power your Mac’s memory, hard drive, CPU, Wifi, keyboard, trackpad and screen. 5V, 3.3V, 1.2V, 1.8V, etc.) in a precisely defined sequence.

#HDMI NOT WORKING MAC RETINA SERIES#

Once the SMC detects that you have pressed the power button, the SMC will co-operate with the Intel chipset to create a series of “mini power supplies” of different voltages (e.g. The System Management Controller (SMC) governs the entire MacBook power-on process. Any of these components gone wrong could cause your MacBook won’t turn on.įrom the moment you press the power button or Touch ID button to the MacBook displaying the image on the screen, your MacBook has gone through a series of complicated power-on events. A MacBook consists of the following components: a screen, keyboard, touchpad, battery, SSD drive and a logic board.

Hdmi not working mac retina