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My home A/C has a timer that doesn't allow the compressor to run for a few minutes if the power goes off. This prevents potential damage from brief power spikes. The blower in the house will still run however. This sounds like what you are seeing.
If there is power from the thermostat in the house out to the electronics at the compressor unit, that means your thermostat in the house is good. I believe the signal from the thermostat in the house out to the timer is 24vdc. In my case, this past month, I had to replace my thermostat because it was not sending the signal out. Once that was replaced, I also found the timer at the compressor was bad. The timer is not expensive at all and can even be bypassed in the short term. If you have power on one side of the timer but it is not going to the other side after it times out, this would be the problem. If your problem is the thermostat control unit, replacement is simple. I think there are only 5 wires that need to be connected. Just check the colors and make sure they go on the correct screws.
It's not too difficult to troubleshoot if you have a voltmeter, a schematic of the unit, and an electrical background. Check your owners manual for a schematic. If you don't have an electrical background, just pay for the service call. There are some fairly high voltages that feed the compressor and a bad shock is not worth the money you might save.
Good luck.
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