Product Information not valid

[IBSONYAX]

I recently bought the system fairly used, I hibernate the computer and changed the Ram to 8gb and ever since the laptop got stuck at the Product information not valid. Please how can i get to fix the problem. 

[PiterGeek]

This error usually come after System Board Replacement where in onsite engineer missed to put certain relevant information while branding the machine.

If so HP has released the following advice.
You may see this message after you send your computer in for service. It indicates that a technician replaced the system board or component but failed to input the new serial number in the system.

To resolve this issue, contact HP for further assistance. You will be asked to provide the fourteen digit System Board Commodity Tracking Number (CT) that is included in the error message.