Hello everyone, today we will learn how to repair the faults of the Apple laptop that

does not recognize the hard drive when it is turned on

The hard drive is not recognized after booting means that the hard drive cannot be detected after booting,

and the system cannot be entered, and a folder icon will appear on the screen

There are several reasons why the hard drive cannot be detected

First, the hard drive itself is damaged, or there is a problem with the hard drive cable

You can replace the hard drive or replace the hard drive cable and test

Second, the interface of the hard drive is corroded and disconnected,

or the working conditions of the hard drive interface are insufficient

We can try to clean the hard drive interface and measure the working conditions of the hard drive interface

Third, the mainboard is disconnected or the chipset is damaged

In this case, we need to measure the ground value of the PCIE bus or SATA bus of the hard drive interface

to determine whether the bus is disconnected

Measure the working conditions of the chipset, such as the power supply of its SATA module, bias resistor, etc.

You can also try to replace the hard drive interface or chipset

Another situation is that the program problem causes the hard drive not to be recognized

We can re-burn the BIOS program, commonly known as flashing the BIOS

Let's look at a case

For example, A1534 cannot recognize the hard drive when it is turned on, which is a common problem

Most of the problems are caused by the power supply chip of the hard drive

The lack of power supply of the hard drive causes the problem

Another reason is that the CPU is soldered falsely

Because the CPU of the A1534 machine does not have a cooling fan,

the temperature is relatively high during use, which may cause the CPU to be soldered falsely,

resulting in the failure to recognize the hard drive

For a machine with a T2 security chip,

a failure of the T2 will also cause the hard drive to be unrecognized,

because its hard drive main control chip is integrated inside the T2

We can try to fix the T2 firmware to solve the problem

Third, if Apple's solid state drive is replaced with a different model,

the hard drive will not be recognized

For example, changing the hard drive of A1466 to other models will also cause the hard drive to not be recognized

There are also some models, such as A1286 and A1278,

whose hard drive cable is also prone to problems, resulting in the failure to recognize the hard drive

Ok, this is the maintenance of hard drive failure not recognized when booting