Hello! I understand that when you start the Bowers & Wilkins app, it shows a power button but it won't turn on. Could you tell me a bit more? For example, which Bowers & Wilkins device or product are you trying to control or use with the app? Also, is the issue that the app itself won’t power on, or the device connected to the app won’t turn on?

This will help me guide you better. Meanwhile, here’s a common first step to try:

1. Fully close the app on your Windows device (WebKit browser).
2. Restart your computer to clear any temporary glitches in the app or device communication.
3. Make sure your Bowers & Wilkins product is properly powered—try unplugging it, waiting 10 seconds, then plugging it back in.
4. Check that your device’s Bluetooth or Wi-Fi (depending on your product) is connected properly with your computer.

If you’ve already tried these or if you can specify your product, I can guide you through more specific steps like a device reboot or app cache clearing.

Could you please share that info?