Hi, I'm Pete. Welcome to JustAnswer! I'm reviewing your question now, and will post back with your reply ASAP.
If the machine will run but will not change speed or incline, then possibly a button is stuck on the console, or there is a loose wiring connection, or the console has gone bad.
Turn the machine off and try pressing all of the buttons several times to check if they appear to be pressing and releasing normally.
If you find a sticking button try and release it.
If that doesn't work, then check for any loose wiring. If nothing is found, the next step will be to replace the console.
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