![]() ![]() At this point you may see or hear the following conditions if a problem arises: The firmware's first routine is to perform a Power-On Self Test (POST) to check for the presence and fidelity of the resources required to properly boot (i.e., RAM presence and abundance, or corruption in the system ROM files). If a vital component is not working properly, then the firmware will detect this and provide an alert or otherwise handle the situation such as by disabling access to the device. The main firmware on the motherboard then gets executed and interacts with the various system components in their "ready" states to ensure everything is running properly. If these components are all in working order, then they will assume a "ready" state to send and receive instructions and data from other controllers in the system. Upon pressing the power button on your system, computer components such as hard drives, add-in cards, and other controllers receive power and start initialization routines to ensure that their hardware is working OK. Understanding these and some of the behaviors that the system might show when problems occur during these steps can help determine what you should do if your system will not boot properly. ![]() A number of events happen when you boot your Mac that activate the hardware and load the system software.
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