We were vacuuming master bedroom, and all of sudden all the receptacles went out, bathroom also and light switch. I got my tester, checked receptacles and get low light when bathroom switch is on, and when I turn the bathroom switch to off the tester shows I have no power to receptacles. I replaced the breaker in the main breaker box with a new one because I thought that might be the problem, still no power. Can you help me, or any suggestions. :confused:

Did you use your tester at the breaker and check the power before and after the breaker?

Do you have a GFI in the Bath? Reset?
Also some breakers will trip but not "Throw", light pressure may reveal tripped breaker.