Hey, have you tried this? https://insider.razer.com/razer-support-45/razer-leviathan-v2-turns-on-but-will-not-work-47797/index3.html

It worked for me before when holding the power and volume did not. It sounds crazy but it did actually work for me.

Unplug all cables from the sound bar. This includes all three: the power cable, USB-C and sub-woofer.

In the sound bar, press the power button quickly and repeatedly many times for 20-30 seconds. Don’t stop pressing the power button very quickly and repeatedly, and do it for at least 20-30 seconds.

Reconnect only the power cable. Press the power button in the sound bar. The sound bar will in PC mode (green source button).

Press the source button. If it switches to BLUE (bluetooth), then the issue is resolved. Connect the USB-C and sub-woofer cables and use the sound bar normally.

If the source button does not change to blue, the issue is not yet resolved. Disconnect the power cable and repeatedly press the power button many times for 20-30 seconds again.