MacBook screen going crazy colours

Question

When I open my MacBook the screen has crazy colours and lines.
It usually stops after a while if I click something or set the computer down on a new surface (maybe the bumping helps something)
It looks a bit like static or TV bars but is all rainbow colours and moves around crazily
Please help
My macbook isn't even old and considering the price of Apple products they really shouldn't **** up like this

Answer 1

Your computer  has a partition on the hard drive that contains Apple Hardware Test (AHT).
To start AHT  please follow these instructions:
Press the power button to turn on your computer.
Press and hold the D key before the gray startup screen appears.
It takes a minute or so for AHT to start up and inspect your hardware configuration.
While this is taking place, an icon appears on the screen.
When the process is complete, select US language and click the right arrow.
You can also use the up and down arrows to select a language and then press the Return key.
The AHT console appears. You can choose which sort of test or tests to perform:
To perform all of the basic tests, click the Test button or press the "T" key or the Return key.
To perform a more thorough diagnostic test, select the "Perform extended testing" checkbox under the Test button before you click the Test button.
Note: Your test results will appear in the window in the bottom-right of the console.
To exit AHT, click Restart or Shut Down at the bottom of the window.
Some computers support the use of Apple Hardware Test AHT over the Internet.