I had to reapply thermal paste because I had to pull my heat sink off since it was a tad loose. I put it back together, started it up, and it all worked fine, except for my pulsating CPU fan. Now, at first I dismissed it because I thought it might be working hard, or something to that extent. It has been about 3.75 hrs since I finished the project, and it has been pulsating non-stop. The CPU load percentages go from 10-30% to 100, then fall, and repeat the cycle. The temps stay around 25C-30C while pulsating, so not terrible. This is a relatively new build at around 2.5 months, with virtually no hardware problems until now.