Solution to reboot and select proper boot deviceor when booting up

What’s going on when a black screen appears when booting up eboot and select proper boot device or insert boot media in selected boot device? How to fix this problem? There are many reasons for a black screen. It may be that the hard disk interface data cable is loose, or the hard disk is broken. Method 1 of reboot and select with a black screen at startup: 1. Here is the Acer motherboard, take this as an example: first restart the computer, press del on the keyboard to enter the boot interface. You can see that the original settings are like this, as shown in the picture:

2. This is due to the fact that the safe boot mode verification is turned on, which causes the Launch CSM under the boot options to be in an unchangeable grayscale state of Never.

3. But when we change the option to disable.

4. The corresponding Launch CSM becomes changeable. Change never to always5 and F10 to save and restart to enter the system.

Method 2: 1. If method 1 does not work, it may be a hardware problem. 2. It is recommended that you disassemble the host, clean the hard disk, memory and other data interfaces, and try to plug them in again.

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