Our arduino mega isnt outputting 5v to our servos and IR sensors. We had an Uno that worked fine and the outputted 5v powered all of our sensors but we has to switch to the mega for more pins. But the mega isnt outputting the 5v to power our sensors. any suggestions as to why this is happening. I think we were sent a bad mega
Were you driving the servos off the Uno? You shouldn't, and could explain the voltage drop with too high a current.
What's the voltage on the 5V pin with no load?