How to replace General Ingchi's 3050 fan?

There are 12 screws on the back, all of which must be loosened. Remove the whole heat sink before removing the fan.

Press the fan by hand. Push harder, because there are four small buttons under the fan, which are fastened at the bottom. Hold it down with one hand, and the other hand will break off the small clip buckled on it, so that one can be taken out first, and the remaining three can be taken out one by one in the same way. The four small wrenches under the fan are parallel to those two white wrenches. Don't hold it too hard, because after most of these fans are used for a long time, the heat sink will stick to the CPU because of silicone. When you hold the fan, you will take it out. If you do, don't panic. Find a wooden thing to push the outer edge of CPU. Don't push too hard. If you push too hard, you may break the pins of the CPU.