I recently noticed that an outlet in the garage, a bathroom (GFCI), an outside outlet, and the irrigation system no longer work. I also recently upgraded the TV in the living room and installed a new wall mount for it (drilling four holes to do so). I do not notice any tripped circuit breakers. The bathroom GFCI outlet can't be reset (the button depresses, but then clicks back out, maybe because there's no current to it).
First, is it possible that installing the wall mount could've hit a cable that would power all of these different places?
How would I go about diagnosing this?
~~~~~~~ Update ~~~~~~
Going off of @jay613's advice of not over thinking things, and his suggested test, I did get current to the bathroom GFCI (which is further away from the panel than the spot I drilled holes for the mount). I didn't know how to safely test after that point with the meter though. Just guessing the path by things that weren't working after that point, the next outlet was an outside one.
After Unplugging a timer that was plugged into the outside outlet (not sure what it powers), I was able to reset the GFCI outlet in the bathroom, and the outlets in other parts of the house now work. I now believe that possibly the TV mount was coincidental timing, and either the outside outlet failed or the timer that was plugged into it failed (probably more likely)
Thank you very much for the help and insights. Very appreciated!