My Macbook will not turn on, even though the battery is fully charged.

Please complete the following steps. Please note that though your Macbook may be fully charged, you will need to ensure that it is plugged in with the charger, before completing any of the following steps: Disconnect/Remove all accessories that are plugged in to your Mac. This includes things like printers, USB hubs, or mobile devices.. Hold down the power button for ten seconds. Then press the power button again to see if the Mac turns on.. If these steps do not work, please complete the following (SMC Reset): Unplug the power adapter from your computer.. Using the built-in keyboard, press Shift-Control-Option on the left side of the keyboard, then press the power button at the same time. Hold these keys and the power button for 10 seconds.. Release all keys.. Reconnect the power adapter.. Press the power button again to turn on your Mac.. If these steps do not work, please contact the YPS IT Service Desk via email to support@yukonps.com or 405.265.1349 or ext. 1504.