Our experienced staff will call you to assess your situation and provide a free quote for you. We offer competitive prices for iMac repairs. We are more than happy to help you if you cannot fix the problems yourself.
IT-Tech Online is a leading Mac repair specialist in Australia. If the power supply has no output, the iMac logic board will not enter into standby mode, so the corresponding LED light will not turn on.
The first LED light indicates the logic board is in standby mode. It indicates the status of the iMac logic board.
The four LED lights are diagnosis lights. If no LED light is on, you have a faulty iMac power supply.
You may need to update to the latest macOS to run the app.
If you updated your iMac’s macOS to one that contains a device firmware update (DFU) but failed to complete the whole process for some reason, you could end up with T2 chip firmware corruption. If the T2 chip is not functional, it won’t respond to the power button and your iMac won’t power on. Starting in 2018, Apple integrated the SMC chip to a larger multifunctional chip called Apple T2 security chip in the new Macs.