Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to clean a keyboard [title] Shut down the computer and detach the keyboard connector before any cleaning procedure. [step] Do not remove or connect a keyboard while the computer is running. Doing so may damage the machine if you have a non-usb-based keyboard.

Ending1: Detaching the keyboard while the computer is running is safe when the keyboard is connected to the computer via usb. [title] For a quick cleaning, turn the keyboard upside down and use a can of compressed air to blow out any foreign matter. Ending2: Instead, you'll need to disconnect or shut off the computer and remove any connection wires and hardware on the keyboard. [substeps] You'll most likely have to repeat this process several times if you don't have access to power adapters, straws, mini batteries, and other electronic objects. Ending3: With any electronic keyboard equipped and plugged in, it will be difficult to replace that with a usb connector. [title] Confirm that all programs are set up. Ending4: [substeps] The keyboard connector is one of the bare wires that sits beneath the keyboard. It can be removed by pulling it out of place and replacing the main part of the keyboard.

Answer format: ending1/ending2/ending3/ending4