Hello:

It should be a hardware problem. It is recommended that you go to the official after-sales department for maintenance services.

You can call Dell’s after-sales service hotline for consultation: 800-858-2969 from a landline; 400-886-8610 from a mobile phone

We will provide you with the inquiry link for Dell’s repair outlets: /cis_index?c=cn&cs=cndhs&l=zh&s=dhs&CID=247239&LID=4282626&DGC=SP&DGSeg=DHS