Customer ATX power supply comes with a complaint is not intermittent power. When testing it with the strength, I can see that the fan does not spin. Not only that, some filter capacitors also become prominent due to the accumulation of heat in the power supply. Fan failure will not suck out the heat generated by components of the switch mode power transformer mainly.
When you turn off the power supply to function and power removed, power transformer tap, you can feel quite warm. Other heat source will be a heat sink in which the output diode attached to it. Diodes run a little hotter in the filter circuit of the diode in the other circuits because high current output channels present in the secondary.
The damage to the fan, you really could use oil-based contact Philips net to serve the fans. Lubricant in the fan will dry after serving for sometime and finally stop spinning. Remove the plastic cover the rear of the fan and spray with contact cleaner, and you'll be surprised fan could actually return back to its glory. This will actually work like a new fan. If it still does not play, the best option is to replace with a new fan. If you have a power supply lying in your workplace so you can save the fans and install them.
Manufacturer deliberate use of such glue to apply the components where they think it will shake or component that comes out when there is vibration or during delivery. After the equipment to work for a long time and the heat generated in the equipment will change to a conductive glue and sometimes will even corrode the pins of components and eventually cause the equipment to stop working.
Scrap it off with your test Thinner pen and use solution for cleaning printed circuit boards. After replacing the capacitor, take the glue and services to rot fan, ATX power supply has given new life to faithfully serve the computer.
Some ATX power supply will take you longer to solve the problem because there are too many 'components on the board. The most frustrating thing is that you can not get spare parts, especially the power ic. Even if you can find one, the price will be sky high and if this happens, I usually will get the customer to purchase new units because of the current new price is quite cheap.