If you somehow managed to break your Macbook screen, you will need to repair it. You shouldn't go to the manufacturer and ask for a screen replacement, but you should have it replaced at a reputable Macbook repair shop. The screen needs to be replaced because it cannot be repaired. A Macbook screen requires a qualified expert to replace it because they are very fragile.
Although a broken screen isn't too expensive to replace, it allows you to buy a new computer instead of having to replace the screen, but you only need to do this if you have an older laptop model that doesn't. They have all the trimmings of the newer models. This might be the right time to design and build a custom laptop to your specifications. You can get the services of MacBook air repairs in Sydney from http://www.iexperts.com.au/macbook-repairs/ whenever needed.
By doing this, you will be able to run all the programs you want and get all the power you need for them. You can add a webcam that will at least allow you to have more fun with your laptop, perhaps at a faster speed, or even make your laptop more productive. However, if you decide to replace the broken screen, you need to make sure that the repair shop transfers all your data.
To avoid a cracked screen, you need to understand that today's laptops, including the Macbook, cannot withstand a lot of abuse. They just don't come with a hardened hardshell case. Many people don't even care about a case. They just carry the laptop in their arms so tightly as they can also cause the screen to break. Also, you should not drop your laptop because this can cause the circuitry behind the screen to be damaged and is one of the best ways to break the screen.
The only real way to protect your laptop from these types of accidents is to invest in a good case for your laptop. However, when you go through an airport security check, you must remove your laptop from the case.