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I see that no breakers have tripped. However, I'm curious as to whether any of the breakers are GFI type breakers? If not, you will probably find the outside outlets to be connected to one of the bathroom outlets.
Another possibility is that there is a GFI outlet in the garage, perhaps hidden behind something. Often, we find customers have these and aren't aware of them, and one has tripped... taking out downstream outlets in the process.
OK, great. I should mention that it's possible for a GFI outlet to appear to work normally, but if you find wires connected to the LOAD terminals on it, those terminals could be dead, not passing power to anything down the line.
I've seen them malfunction in that manner, while still working for something plugged in to the GFI outlet itself.
Yes, this could definitely be caused by a failed breaker. Do you have a volt meter you can use to test the output of each breaker?
Sounds good. We can continue here tomorrow evening, and the meter will be helpful.
There should be a VAC setting. If you don't see it, post the model of the meter and I'll look it up Online.
Do you see the V with the wavy line, next to the number 200? It's at about the 10 o'clock position on the dial. Please set the meter to that setting.
Place one meter probe on the bar that has all of the bare wires. One at a time, touch the other probe to the breaker terminal screws. By the way, is there an empty port on the meter that a probe could be plugged into?
OK, good. You have the probes set up properly. Please post any abnormal readings here. You are looking for about 120 volts from each breaker terminal.
I was afraid of that. I was hoping it would be as easy as a bad breaker. You may need a circuit tracer if you want to track this down quickly. But that's not something you should run out and buy. It would be cheaper to rent one if you can find one for rent.