Jets will not come on
There are several things to check.
the first and most likely is that you have a Ground Fault Circuit Interrupter (GFCI) that is tripped.
It is required by code to have any whirlpool tub, spa, or similar equipment GFCI protected. on a whirlpool tub, a good electrician will place the GFCI device within sight of the tub, in the bathroom. it looks like the same GFCI receptacles you have on the countertop, but without holes to plug things in. a lesser electrician will place a GFCI receptacle inside the service access underneath the tub. (this can be a hatch in the side of the tub, or a cabinet door in on a wall adjoining the room) a bad electrician has been known to place it in a completely different room, or under the floor, with the power cord of the tub passed through the a hole in the floor to plug in. find this, and press the reset button. if it solves your problem, great. if not, go to step 2 (also, occasionally, the GFCI device is a GFCI breaker inside the breaker panel - check to make sure the breaker is turned on and not tripped, as well)
If you reset the GFCI and it immediately trips again, there may be a problem with the pump motor. find the access hatch (if you haven't already) and unplug the tub. try the reset again. if it holds now, it is the pump. if not, it is either a failed GFCI (have it replaced) or a ground wire in contact with a neutral wire. (fixed by moving the ground)
if the GFCI resets, or will not reset (newer GFCIs have an interlock feature that prevents them from resetting if they don't like the flavor of the incoming power) and there is still no power to the pump (use a plug tester, or plug a lamp, or radio in to test and make sure there is power to the spa tub), and you have confirmed that the breaker is on, there may be a switch that is off, (the same electrician who put the GFCI device in a walk-in closet across the hall, also had a switch that turned the whole thing off) or there may be a wiring problem somewhere. at this point, it might be worth your while to bring in an electrician to trace down the problem. - you would have to check each point in the circuit to find where there is a wire disconnected or broken.
If there is no problem with the electricity to the tub, then you have either a switch problem or a motor problem. the motor problem is unlikely, as it usually results in electrical symptoms, as well. the switch is an air switch. the button on the tub is an air plunger, that pumps air into a tube, and pushes another plunger in the switch that turns the pump on and off. the plunger can stop pushing air (unlikely, but possible) the tube can come loose, or the switch can stop working. the first two are easily user-repairable. the last may take an authorized service professional, depending on the design of the pump.
If you have acces to the pump and switch please let me know I will walk you through what to look at there to fix if the plug is good.
good luck with this - hopefully it is just a GFCI.