A forbidden symbol appears when mac pro is turned on. How to cancel?

The forbidden symbol appears in Mac boot, which means that the system itself is completely lost.

In order to solve this problem, it is suggested to adopt network recovery mode or USB flash drive recovery mode to restore the computer system.

The specific operation is as follows:

Method 1: network recovery mode

1, first press the power button on the mac to turn it off. When the screen is not bright, press cmmand+r, and then press the power button. If you want to upgrade the installation, press Option+CMM and+R. The same version has different effects.

2. Suppose the computer is? MacOS is higher than Sierra, then add shift +option+cmmand+r to the shortcut key in front, and let go after the Apple logo or the Earth logo appears.

3. After the earth sign appeared, the time was below this earth.

After turning off the power, press and hold the option on the keyboard for five seconds, and then press the power button. Start timing by pressing the power-on key. Then the icon in the figure will appear, select the network and enter the password, and then click the disk icon to restore the system.

Method 2: U disk recovery mode

1, press cmmand+r on the keyboard, and insert the USB flash drive into the mac after seeing the earth logo. Mac will directly load the system into the USB flash drive, because the system crashed.

2. After entering the interface shown below, click Disk Utility and select Continue in the lower right corner.

Then click the built-in position at the top of Figure 2, enter the English name, select apfs as the format, and click Erase.

3. After erasing the disk, click Disk Tool in the upper left corner, select Exit Tool, and then click Reinstall mac, and the computer will automatically copy the system of the U disk to the mac.

4. Then an installation interface will appear, and click Install.

5. Then select the disk, which is the erased name entered above. The next step is to wait quietly. General installation takes about half an hour.

6. Do not unplug the USB flash drive during system installation. The installation process will automatically restart the mac several times, and you need to connect the power cord to the mac to continue.

7. The recovery was successful.

Mac Pro is Apple's professional desktop computer.

It is equipped with Intel Xeon microprocessor and PCI Express architecture.

Apple Computer Company announced this computer at the World Developers Conference (WWDC) on August 7, 20 13. It is an alternative product of Power Macintosh.

Its aluminum case is almost the same as that of the Power Mac G5, except that the slot of the CD-ROM drive is enlarged and the front and rear I/O ports are rearranged.