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Apple computer black screen

Hello, the reason: Apple Mac Parameter Random Access Memory (PRAM) and System Management Controller (SMC) control many hardware modules of the MAC system. When a hardware module fails, it will fail to boot, battery failure and so on. At this point, PRAM needs to be reset.

1. First find the icon with eyes in the application on the left, and right-click to exit.

2. Next, click the logo according to the red idle arrow, and then click Shut Down on the logo menu.

3. Then press and hold Option+Command+P+R on this keyboard for less than 20s, and the Mac will restart. If you don't restart, it means you pressed the wrong button or pressed the wrong time.

4, and then press it correctly, you will see the logo and automatically start it to the desktop, that's all.