Why is my computer very loud?

Conor Most, you will have to find out why it does that. Check your computer resources and see what the total demand is. Make sure that your laptop has unobstructed airvents. Make sure that those vents are clean. If all that is normal you will have to disassemble your computer and take a look at the Fan. I would replace it for sure. Check the heatsink and assembly and replace the thermal paste. download the service manual from here Page 73 will tell you how to replace all that . Hope this helps, good luck