Turn on or reset the GFCI circuit breaker. If this does not solve the problem, contact your dealer or a qualified spa technician.
If you hear the pump running but the control panel doesn't respond, contact your dealer.
Spa may be trying to heat up. Check if the spa setting is in Standard mode. In cold climates, if spa is not equipped with full foam or any kind of insulation, it will try to maintain the set temperature. Set the spa to Economy Mode and set the temperature to 80°F.
Spa may be in filter cycle. If it is, this is normal and no adjustment is necessary.
If there is a message on the control panel, there may be a problem. See diagnostic messages.