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Hi, I'm Mike G and I'll be assisting you. Well the problem no doubt was caused by a box with not enough room for conductors and device. At best it was only large enough for one cable 14/2 and a receptacle. You should open the box to verify. Let me know what is above and below the room for advise as to what you can do.
You're not going like like this but it is necessary. You need to open the wall and install a Tyco Tap to only have the one cable in the finished box. The Tyco allows for a concealed junction in the wall. They are available at Home Depot.
You must have tried a breaker. Check all breakers. They sometimes look on but if the handle is loose, they're tripped.
What are you using for a tester?
OK, you'll need to test a dead outlet to determine what the problem is. Test as follows;
Hot to neutral
Hot to ground
Neutral to ground
Let me know if you get a voltage reading.
Any receptacle not working.
Non working outlets.
If a bathroom receptacle is on the circuit, check for a tripped GFCI receptacle.
You need to follow my instructions on testing. You need to know what we're looking for and testing as instructed will show what the cause is for the problem. Test for voltage as directed and if none, test for continuity neutral to ground.
Pick one ahead of where you installed the box that is closer to the panel and not working.
Very well, good luck.