Hello today i cleaned my stock cpu fan with tap water dried it up and put it back in.
I am guessing that some residual water that may have been under the cap of the fan body got whipped out when it spun up and this water may have made contact with sensitive electronics on the main board.
Introducing water of all things to this was not a very good idea.
Its best to use canned air or a vacuum cleaner. Although canned air is safer since a vacuum cleaner with dry air can build up a static charge and arc to components when sucking up dust. Both methods vacuum or air pressure you have to be careful your not removing any jumpers from motherboard etc.
If your lucky you can give the computer a few days to air dry and see if it then behaves. This drying process can be accelerated with a hair dryer, but you do not want to overheat components with a hair dryer either.
You may have damaged your system permanently by this act of using water to clean the CPU fan. If your lucky you will only have to replace the heatsink/fan and be back up and running. There is a small circuit board out of view at the core of this CPU fan that sends magnetic pulses to a magnet that is shaped like a ring under the center cap. If there was still a small drop of water in there under IC legs when powered it could have sent 5 volts to the 3rd wire the tach, and I am unsure as to if sending 5 volts directly to this tach leg if it will destroy a motherboard or not as for I have never intentionally done this to see what happens.
Best of luck with this, but I have doubts if this can be fixed if it doesnt go away after a few days to air dry and CPU heatsink/fan replaced. Also I would leave this computer unplugged from wall power for a few days if air drying as for this way if water is under IC legs that are soft powered you will not have electrolysis destroying chips and motherboard traces. Electrolysis happens when a drop of water forms a circuit in electronics and causes almost an acid like reaction of damage to the affected area which can lead to terminal damage of components and board surfaces.
Also if you removed the heatsink from the CPU thru this process, hopefully you removed the old thermal compound and applied a drop of new thermal compound such as arctic silver which I use, otherwise your CPU may be roasting hot and not adequately cooled which on much older CPUs lead to damage to the CPU ( especially the AMD Athlon XP's ) which would china syndrome (CPU Melt down ) until the power supply would short, while most modern CPUs will thermal throttle to avoid a melt down and the computer will just act very slow.
