Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to clean thermal paste [title] Switch off all power. [step] If your computer's on, open the main menu on the home screen. Select " shut down " or equivalent to turn off all power.

Ending1: [title] Run the magic cup test on the largest part of your computer. [step] Press the x button on your magic cup area to start the magic cup testing. Ending2: Don't trust pushing the " power " button to turn off all power. More often than not, this only puts your computer into " sleep " mode. Ending3: [substeps] You may have to do this multiple times before the device shuts off completely. [title] Remove the dish-liners and grime with a damp cloth. Ending4: [substeps] If you have never shut off your computer's power at home, then turn on every power option, and follow the options in the main menu. [title] Use your thermal paste as a cleaner.

Answer format: ending1/ending2/ending3/ending4