[Toll free +1 (844) 886-3118 ] Sometimes yes sometimes no, I had both things happen when I have replaced a motherboard in the past. Sometimes you have to reinstall windows, other times you don't.[Toll free +1 (844) 886-3118 ]
However, I would recommend picking https://mssupport.tech/ up a new Windows 10 activation key on ebay, I have four of them, they're $25, companies like Best Buy in micro center would have you pay anywhere between $150 to $200 for them.[Toll free +1 (844) 886-3118 ]
Here's a little secret Microsoft doesn't want you to know, you can use a Windows activation key an unlimited amount of times. Also, both Windows 7 and Windows 8.1 keys work to activate Windows 10, just thought it would mention that.[Toll free +1 (844) 886-3118 ]
Microsoft no longer provides traditional keys which could in the past be used on multiple systems.[Toll free +1 (844) 886-3118 ]
For Windows 10 only a digital license that is associated with your PC hardware is issued to prevent piracy. Any changes you make to the hardware https://mssupport.tech/ like replacing your motherboard, the given license key won't be valid.[Toll free +1 (844) 886-3118 ]
However Microsoft has recently pushed an update in July, 2018 which introduces Windows 10 Activation Troubleshooter.[Toll free +1 (844) 886-3118 ]
To run the Activation Troubleshooter
1. Go to Settings menu and then to the Update & security. Click Activation and then click Troubleshoot.[Toll free +1 (844) 886-3118 ]
2. Select I changed the hardware on this device recently and sign into your linked Microsoft account.[Toll free +1 (844) 886-3118 ]
Select the device you're currently using and click Activate.[Toll free +1 (844) 886-3118 ]
It shouldn’t fail due to any (removable) hardware change as Windows activation has historically been tied the the computer’s MAC address. This is the unique 6 byte value burned into [Toll free +1 (844) 886-3118 ] the Ethernet chip on the mainboard https://mssupport.tech/ and how many software packages identify your system for licensing purposes. For mobile devices that do not have an Ethernet port, like cellular phones, there is a unique cell chip ID. For computers without Ethernet, it’ll likely be something else burned into the mainboard that uniquely tags the system, never something upgradeable.[Toll free +1 (844) 886-3118 ]