This is a common problem that students face. Find the power button on the right side of the laptop. Hold it down for about 30 seconds (it will feel like forever). The laptop will turn off along with the power light. Then it will wait for a bit and turn on again. Once the screen lights up again, you can remove your finger.
This resets any saved cookies or other internet settings. It should fix the problem with Farm 2. If this does not fix the laptop, please report the issue to your teacher right away so that he or she can send it to the school IT person for repair.