Failed to create D3D9 Device!

I was playing A Hat in Time, and suddenly the game crashed. When trying to load the game up again I get the following message:

Failed to create the D3D9 Device! This can happen if the desktop is locked. Exiting...

I have ran dxdiag which says everything is hunky-dory.

directx-9 a-hat-in-time

Best Answer

You can try the standard fixes:

Reboot your computer.
Verify Integrity of Game Files.
Update your drivers.

People have reported the following fix the issues.

Setting Game Launch Options to -dx9.
Browse Local Files.
Right click A Hat in Time; press Properties...; select Local Files tab; select Browse Local Files...
This will open an explorer window to steamapps\common\HatinTime. From here navigate to HatinTimeGame\Config and open HatinTimeSystemSettings.ini

Edit game config.
steamapps\common\HatinTime\HatinTimeGame\Config\HatinTimeSystemSettings.ini

From here there are two reported fixes:
- Edit ResX and ResY to smaller values.
```
ResX=1600
ResY=900
```
- Set Fullscreen to false.
```
Fullscreen=False
```

For me setting fullscreen to false worked.
The game set my vertical monitor as the default, and then positioned the game on a different monitor.

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How do I fix failed to create D3D9?

D3D errors typically occur if you are running the game at settings which your machine does not adequately support or if you are running outdated video drivers. Other potential causes include outdated Windows installs or larger video card issues.