1. The after-sales service provided by HP Gold Service Center is very good. You can feel free to contact the local Gold Service Center for corresponding testing and processing.
Note: Regarding maintenance costs, maintenance materials and cycles and other related maintenance issues, it is recommended that you contact us by phone before going to avoid unnecessary travel.
2. The contact information of Shijiazhuang Gold Medal Service Center is as follows:
Contact number: 0311-86113883/8613370/8613310 Address: No. 206, Dongfeng East Road, Shijiazhuang.
3. Regarding the screen jitter problem you mentioned, it is recommended that you keep clicking F10 to enter the bios when booting (or restarting):
A. If the display in the bios is normal, then There is nothing wrong with your machine hardware. The problem you mentioned is most likely caused by a driver or system problem. It is recommended to update the graphics card driver to see if this problem can be solved. If necessary, you can back up your data and reinstall the operating system.
Note: Regarding how to download the driver of the corresponding product from the HP official website, we recommend that you refer to the following official documents:
/portal/site/hpsc/public/kb/docDisplay/? docId=emr_na-c02903029
B. If the bios jitters, it may be related to the hardware. It is recommended to contact the Gold Service Center to repair the hardware.
I hope the above reply can help you.