If your elliptical will not power on, check the following:
Is the unit plugged in? Check at the wall, at the power input of the machine, and at the power supply.
Is there power from the wall? Plug a lamp or radio into the outlet. Does it go on? Does a light switch control the outlet?
Is the console properly connected to the base unit? Refer to your assembly instructions to remove the console and check the connections from the console to the upright tube and the connection below the mast boot.