Windows Won't Activate After a Motherboard or Hardware Swap? Reactivate With Your Microsoft Account
You replaced your motherboard (or another major component) and now Windows shows “Windows is not activated” with a watermark.
Why: A digital license is tied to your specific hardware. A big change — especially the motherboard — makes Windows think it’s a different PC, so it can’t match the license until you point it back to your account.
Fix 1: Run the Activation troubleshooter and confirm the hardware change
This is the supported, built-in way to move the license. You must be signed in as an administrator with the Microsoft account your license is linked to.
- Open Settings > System > Activation.
- Expand Activation state and select Troubleshoot.
- Select I changed hardware on this device recently, then select Next.
- Enter your connected Microsoft account email and password, then select Sign in.
- In the list of devices linked to your account, tick This is the device I’m using right now.
- Select Activate.
If the device isn’t in the list, you may have signed in with the wrong Microsoft account, or the license was never linked (see the FAQ).
Fix 2: Link your Microsoft account first (if “I changed hardware” is missing)
The “I changed hardware” option only appears when your digital license is connected to a Microsoft account. If you were using a local account, add the Microsoft account, then retry Fix 1:
- Go to Settings > System > Activation.
- Select Add an account under your activation/Microsoft account section.
- Sign in with your Microsoft account.
Going forward, link the account before you change hardware so reactivation is smooth.
Fix 3: Re-enter a retail product key
If your license came from a 25-character retail key (not a digital license linked to your account), the troubleshooter may not apply. Instead:
- Go to Settings > System > Activation > Change product key > Change.
- Enter the same retail key. A genuine retail key is transferable and can reactivate on new hardware.
If it’s blocked, you may need to activate by phone via the Get Help app or Microsoft Support.
FAQ
Can I reactivate an OEM license on a new motherboard? OEM licenses are tied to the original PC and generally can’t move to new hardware. Retail licenses and Microsoft-account-linked digital licenses can.
The troubleshooter says my account has no matching device. Sign in with the exact Microsoft account that was on the PC before the swap. If it still isn’t listed, contact Microsoft Support through the Get Help app.
Sources: Microsoft Support — Reactivating Windows after a hardware change, Microsoft Support — Get help with Windows activation errors