This is normal. The sound is a slight clatter. It's the sound of the CD drive starting. Don't care.
Lenovo M5400A is a series with many notebooks. It is recommended that you look for the text at the bottom of the computer. Generally, there will be specific notes on it [Detailed]
If no one answers this question, they will have the opportunity to be accepted and rewarded accordingly. Let me answer
ZOL certification Shenxinfu Electronic Technology Co., Ltd
First level certification
Same price, same brand, same input voltage
Same price, same brand