According to your description, I suggest you refer to the following information:
The problem you mentioned is probably caused by the loss of information on the machine motherboard. It is recommended that you directly contact your local HP Gold Service Center for handling. For the contact information of the Gold Service Center, you can choose your province and city and the product type you use through the following websites:
/zh/support-drivers/e support/as CPPS . html
I hope the above reply can help you.
If the above information can't solve your problem, you can log on to www.hp.com.cn/chat,, the online chat room of HP Network and ask an online engineer to help you solve the problem further.
More product information is available in www.hp.com.cn/800..