Q: why wont my new macbook charge?

If you have tried everything, perhaps a visit to an authorized Apple service provider

could be helpful because there are things they can do to further diagnose the issue.

Is the computer in question a new 12-inch MacBook Retina, that has no optical drive,

and has only USB-C ports for charging and attaching peripherals? If not, then you

should further describe the build model year and exact product, since there are many

different products with the MacBook name, from 2006; including /Air, /Pro, and the

name has been recycled again for the new metallic retina 12-inch for 2015+.

If the battery had been run too low, then computer would not be able to do anything;

it may take several hours charging before any evidence of booting could appear. If

the battery has been let run flat, on several occasions, that can damage the battery

and the result would be short battery life and perhaps other damages as well.

Did you try a reset of NVRAM?

• How to Reset NVRAM on your Mac - Apple Support

How about the SMC reset?

• Resetting the System Management Controller (SMC) on your Mac - Apple Support

To correctly identify the exact model of MacBook, when no details are given,

is essential to further this discussion. If an official Apple Store with genius staff

can be contacted in your locality, that would be recommended for you to have

the computer tested and they can recommend a course of action from that.

Usually an appointment should made ahead of a visit to reserve time for you.

Good luck in this matter!