There are a few things which could cause the problem that you describe. However, as your laptop is less than a month old go back to the vendor/shop where you bought it and get them to sort it out. Take your receipt with you.

You have an automatic 12 month warranty with a new item. Don't try and do anything yourself as this may invalidate the warranty.

The onus is on the vendor. They either have to give you a new unit, refund your money or repair/refurbish it.

This may sound like a cop-out but you'll find that vendors are very helpful indeed. Laptops aren't easy to repair by yourself .. so .. let the vendor sort it out. Consumer law is on your side.

A few years back I bought a brand new laptop in a computer superstore. When I got it home it didn't work. The next day I went back to the superstore and there in the queue at the customer service desk was a woman who had bought an identical model the previous day .. and it didn't work. All sorted out within minutes.