The Steam Deck may fail to turn on after switching to desktop mode due to conflicting software states. To resolve this, perform a hard reset by holding down the power button for at least 12 seconds. Alternatively, try booting into the SteamOS recovery partition for advanced troubleshooting options.

If the issue persists, consider inspecting the hardware components. Examine the charging cable and port for any damage. Connect the Steam Deck to a different power source to rule out electrical outlet issues. Additionally, check for any loose connections or debris inside the device’s USB-C port.