How to fix computer fan loud buzzing noise Problem: Computer CPU fan always making a very loud buzzing noise every time I open heavy software like photoshop & even just browsing the internet using chrome or firefox. Troubleshooting Tried: 1. Cleaning the computer CPU box 2. Re-seating all connected parts (ram, hdd, cpu heatsink/fan, power supply, & cables) Solution: 1. Adding thermal paste to CPU (old thermal paste is already thin & almost none)