How do i reset and restart my intermatic T104p3 after power outage? the gears don't turn and the timer is new.

You have to have the On and Off "trippers" firmly installed against the yellow timer dial and the thumb screws on them must be tight. Turn the time dial by hand to be sure it trips the lever back and forth. If that part if working OK then you will need someone to come and make sure the load (device you're controlling) is connected to it properly and of course the timer is indeed running and appears to be keeping the correct time. You can check that a half hour after setting it to the current time.

Timer is wired wrong?
T104P3 is 240Volt timer with WG1573 clock motor
But you have 120Volts?
And you replaced breaker(s)?
Copy following links:
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T104
http://waterheatertimer.org/images/Inside-Main-Breaker-Box-12.jpg
http://waterheatertimer.org/How-to-replace-circuit-breaker.html

Gene
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Open following link for Utilitec timer manual:
http://waterheatertimer.org/Program-wire-Utilitec-LW60418.html

This timer should have a back-up capacitor so that programming is kept in memory during power outage.
Power outage is known cause of timer failure. When power turns on, the surge knocks out electronics.
People writing to fixya report electronic timers and electronic water heater controls stop working after power outage. Probably many other electronic devices are affected too, but that would be out of my specialty.
Troubleshoot says 'in case of operational failure, press reset button to clear all settings and restart.'
If timer has failed, buy another from Lowes and return defect in new package.

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1) Manual switch is working, and that says electricity, circuit breaker, wiring, and pump are good.
If timer dial is rotating and keeping good time, then order new 156T1978A trippers.
If dial is not rotating, then order 240Volt WG1573 clock motor.

2) Open following links for troubleshoot walk-thru and replacement parts list.
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-timer.html
http://waterheatertimer.org/Intermatic-trippers-and-parts.html#T100

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Question posted under Intermatic ST01C, but Timer is not 100% identified since ST01C is battery powered, and should not lose programming or stop working with ordinary power outage.
Most digital timers have a battery or capacitor back-up for power outage.
Add a comment with description of timer buttons, or open link below to see most brands of in-wall timer.

Open following link for to identify Intermatic ST01C and Ei600 and download instructions:
http://waterheatertimer.org/ST01C-program.html#battery
ST01C timer has a battery backup. Power outage will NOT cause battery-powered display to fail, but power outage and power surge can cause any electronic timer to fail.
So either the battery went dead, or power surge ruined timer, or you don't have ST01C timer.

If ST01c display is not showing, then replace battery and then reprogram current time -or- manually re-set timer and then reprogram timer.

Sound is coming from 3 watt clock motor located on back of timer mechanism.
It is not a problem unless clock motor is running slow.
You can turn power off, remove mechanism from enclosure using thumb spring located top inside box. Spray WD-40 on clock gears and see if sound stops.
WD40 vapor is highly flammable accelerant so don't spray on hot surface or live electric connections.
WG1573 clock motor can be purchased separately.

Resources
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-timer.html
http://waterheatertimer.org/Intermatic-trippers-and-parts.html#T100

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And take advantage of fixya expert assistance live.
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Other than testing to verify you have power at the line in terminals not much you can do as far as repair that I know of. If power checks ok probably need to replace.

TO INSTALL THIS MOTOR REMOVE SCREW ON LEFT AND JUST BACK SCREW ON RIGHT A FEW TURNS, TIMER WILL ROCK UP OUT OF BASE THIS WAY . UN-HOOK WIRES ONE AT A TIME AND INSTALL WIRES FROM NEW MOTOR ONE AT A TIME.. THESE TWO WHITE WIRES GO TO LINE 1 AND 2 THESE ARE THE WIRES THAT GO TO THE 220 VOLT BREAKER ... NEED MORE HELP JUST GIVE ME A BUZZ.. JAY ..LOOK EBAY FOR .. Intermatic Timer Motor WG1573 / WG1573-5 clock POOL FIX

LOOK HERE ON EBAY .. Intermatic Timer Motor WG1573 / WG1573-5 clock POOL FIXTO INSTALL THIS MOTOR REMOVE SCREW ON LEFT AND JUST BACK SCREW ON RIGHT A FEW TURNS, TIMER WILL ROCK UP OUT OF BASE THIS WAY . UN-HOOK WIRES ONE AT A TIME AND INSTALL WIRES FROM NEW MOTOR ONE AT A TIME.. THESE TWO WHITE WIRES GO TO LINE 1 AND 2 THESE ARE THE WIRES THAT GO TO THE 220 VOLT BREAKER ... NEED MORE HELP JUST GIVE ME A BUZZ.. JAY

Grasp the yellow dial and pull towards you and make user it's seated in the gear that turns it. (same as resetting the time). If that doesn't do it, it may have a bad timer motor.