First enter the motherboard's BIOS, F5 to restore the default, F10 to save and exit, and then perform settings again. If it doesn't work, I suggest you take it to the merchant and ask for help. There may be a problem with the motherboard's controller.

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There is an error in reading disk A. Press Ctrl+Alt+Del to restart.

There are many reasons for this problem:

1. Check whether there is a floppy disk in the floppy drive, then enter the BIOS and turn off disk A in the boot sequence.

2.Set "Anti-Virus Protection" to Enable in BIOS settings. If this is the reason, enter the BIOS and turn off "antivirus protection".

3. Error writing boot area. Restore the BIOS to default, then re-plug and unplug the optical drive data cable, or change the optical drive data cable.

4. There is a problem with the hard disk. The problem usually lies in the hard drive cable and bad sectors of the hard drive. If it is on the cable, unplug the cable, clean the dust on it and the hard disk, then plug it back in or replace the cable to solve the problem.

5. Use FDISK to repartition (data will be cleared, use with caution.)

6. The fourth possibility is the most likely. It is recommended to try it first.

The prompt when the fault occurred was "a disk read error occurred press ctrl+alt+alt to restart". At that time, I used "fdisk/mbr" as mentioned above, but it didn't seem to work. Later, I tried to change it in the BIOS settings. Change the hard disk mode from "standard mode" to "enhanced"