Razer Synapse Not Working on Windows 10? Fixes

If Razer Synapse is not working on Windows 10, the fix usually involves reinstalling the software, updating Windows, or clearing corrupted cache files. Below are the exact steps to resolve the most common causes, from driver conflicts to broken services.

Why Razer Synapse Fails on Windows 10

Razer Synapse is a cloud-based peripheral manager that stores device profiles, macros, and lighting effects. It depends on several Windows services and a background process called Razer Synapse Service. When any of these break, the app may not open, devices may not be detected, or settings won’t save.

Common triggers include:

• Windows updates that change driver signatures or service permissions
• Corrupted Synapse installation files from a partial update or antivirus interference
• Outdated Razer drivers that conflict with newer Windows builds
• Leftover registry entries from a previous Synapse version

Step 1: Restart the Razer Services

Often the software appears to be running but the background service has stalled. Restarting it takes seconds:

1. Press Ctrl + Shift + Esc to open Task Manager.
2. Go to the Services tab and look for entries starting with Razer (e.g., Razer Synapse Service).
3. Right-click each and choose Restart. If they are not running, right-click and select Start.
4. Close Task Manager and launch Synapse again.

If the service is missing entirely, proceed to the reinstall step below.

Step 2: Clear the Synapse Cache

Corrupted cache files are a frequent culprit. Razer stores temporary data in a hidden folder. Removing it forces a clean rebuild:

1. Close Synapse completely (check the system tray icon and right-click → Exit).
2. Open File Explorer and type %ProgramData%\Razer in the address bar.
3. Delete the Synapse3 folder (or Synapse for older versions). Do not delete the Razer folder itself.
4. Also go to %AppData%\Razer and delete the same subfolder there.
5. Restart your PC and open Synapse. It will rebuild the cache.

This does not delete your profiles if you are logged into a Razer account, but it will reset local settings like lighting presets.

Step 3: Reinstall Synapse Cleanly

If restarting services and clearing cache do not work, a full reinstall is the next step. Use the official Razer installer from razer.com, but remove all traces first:

1. Uninstall Synapse via Settings → Apps → Apps & features.
2. Reboot your PC.
3. Download the latest Synapse installer from Razer’s official site.
4. Right-click the installer and select Run as administrator.
5. Follow the prompts, then reboot once more.

If the uninstaller leaves files behind, use the Razer Synapse Remover tool (available on Razer’s support page) to wipe everything before reinstalling.

Step 4: Update Windows and Drivers

Synapse is tightly integrated with Windows, so an outdated OS can cause failures. Go to Settings → Update & Security → Windows Update and install all pending updates. Also check for Razer device drivers:

• Open Device Manager (right-click Start → Device Manager).
• Expand Mice and other pointing devices and Keyboards.
• Right-click each Razer device and select Update driver → Search automatically.

If Windows reports the best driver is already installed, try uninstalling the device in Device Manager (check “Delete the driver software for this device”) and then reboot. Windows will reinstall the generic driver, and Synapse should reattach.

Step 5: Disable Fast Startup

Windows 10’s Fast Startup can prevent Synapse from initializing properly after shutdown. To disable it:

1. Open Control Panel → Power Options.
2. Click Choose what the power buttons do.
3. Click Change settings that are currently unavailable.
4. Uncheck Turn on fast startup and save changes.

This is a known fix for many peripheral software issues, though it slightly increases boot time.

Step 6: Check for Antivirus Interference

Some security programs flag Synapse’s background service as suspicious because it injects code into games for overlays. Temporarily disable your antivirus (not Windows Defender) and see if Synapse opens. If it does, add the Razer folders to the antivirus whitelist:

• C:\Program Files\Razer
• C:\ProgramData\Razer
• %AppData%\Razer

What If Synapse Opens But Devices Aren’t Detected?

If the app launches but your mouse or keyboard is missing, the problem is usually the USB connection or a driver mismatch. Try:

• Plugging the device into a different USB port (preferably a rear panel port).
• Using a USB 2.0 port instead of USB 3.0 if available.
• Connecting the device without a USB hub.

If the device still does not appear, check if it shows up in Device Manager under Human Interface Devices. If it shows an error icon, right-click and uninstall, then reboot.

Frequently Asked Questions

Why does Razer Synapse keep crashing on startup?

This is almost always a corrupted cache or a conflict with another RGB software (like ASUS Aura or Logitech G Hub). Clear the cache as described in Step 2, and close other peripheral apps before launching Synapse.

Will reinstalling Synapse delete my macros and profiles?

If you have a Razer account and are logged in, your profiles are stored in the cloud and will sync after reinstall. Local profiles that were never synced will be lost. To be safe, back up your profile files from %AppData%\Razer\Synapse3 before uninstalling.

Can I use Razer devices without Synapse?

Yes. Basic mouse and keyboard functions work with Windows default drivers. You lose macros, custom DPI, lighting effects, and key remapping. Some devices have onboard memory to store a profile, but you need Synapse to set it up initially.

Why does Synapse say “device not connected” when it is plugged in?

This usually means the device driver is not loaded. Unplug the device, restart your PC, and plug it back in. If that fails, uninstall the device from Device Manager and reboot.

Does Synapse work on Windows 11?

Yes, current versions of Synapse support Windows 11. If you upgraded from Windows 10 and Synapse broke, follow the same reinstall steps. The software treats Windows 11 similarly to Windows 10.

Is there a way to fix Synapse without reinstalling Windows?

Yes. The steps above cover the vast majority of cases. Only if the problem persists after a clean reinstall and driver updates would you consider a Windows repair install or reset, which is rarely needed.

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