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Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, have you tried on the left side? ...the button below the headset/speaker jack?
Please click HERE; no button as encircled in red?
As may be viewed HERE, the On/Off button would be towards the right or below the earphone jack of the Switch 10 (depending on how it is positioned). Were you able to locate it?