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3、After booting, at the boot POST screen (the first screen of the boot)
Solution:
A. Unplug the keyboard, mouse device, and then confirm whether it is normal.
B. Unplug the hard drive, and then turn it on to confirm whether it is normal.
C. Shut down and clean COMS (unplug the twist button battery for 30 seconds), and then turn it on to confirm whether it is normal.
D. Re-flash the BIOS, and then turn on the power to confirm whether it is normal.