Testing an Installed Fan
Step 1
Download and install SpeedFan. This program uses data provided by sensors in your computer's hardware to display information about the temperatures of various components and the speed at which the APPLE CPU Fan for those components are rotating.
Step 2
Launch SpeedFan and wait a few minutes for it to retrieve data.
Step 3
Examine the information presented in the main program window. The speed at which your computer's fans are rotating, measured in revolutions per minute, is on the left side of the window, while temperatures of various components are on the right side. The RPM data for the CPU fan is listed first, but may be labeled differently depending on the data sent by your hardware.
Step 4
Check the RPM data for your CPU fan and compare it with the normal RPM range listed in the manual or specifications sheet for it. A particularly low RPM number may indicate your fan is failing.
Step 5
Click the "Charts" tab, select "Fan Speeds" using the drop-down menu and place a check mark next to the label corresponding to your CPU fan to begin generating a chart of the variation in the fan's speed. Leave the program running for some time while you use your computer. Later, check the chart; a significant variation in the RPM number, in the order of 1000 to 2000, may also indicate a failing fan.
Testing a Fan Separately
Step 1
Remove the power supply from your computer, disconnecting all cables. If you have access to a spare working power supply, using that one instead will save you the time spent disconnecting it and reconnecting it.
Step 2
Check the power supply for a three-pin fan connector. Many modern power supplies have this connector; if your power supply lacks it, you will need to purchase a four-pin Molex to four-pin Molex plus three-pin fan splitter cable.
Step 3
Bend or cut a metal paper clip to create a "U" shape.
Step 4
Identify the 24-pin main power connector and locate a green wire and a black wire.
Step 5
Insert one end of the U-shaped paper clip into the pin corresponding to the green wire and the other into the pin corresponding to the black wire.
Step 6
Connect the fan you want to test to the power supply using the three-pin fan connector and, if necessary, the splitter cable.
Step 7
Plug the power supply into an electric socket using the appropriate power cable and, if necessary, turn it on using the switch on the back of it. Check whether APPLE CPU Fan on the power supply is spinning to ensure it is on.
Step 8
Check if the fan you are testing is spinning, if it's making any odd noises, stuttering or abruptly changing speeds.
Step 1
Download and install SpeedFan. This program uses data provided by sensors in your computer's hardware to display information about the temperatures of various components and the speed at which the APPLE CPU Fan for those components are rotating.
Step 2
Launch SpeedFan and wait a few minutes for it to retrieve data.
Step 3
Examine the information presented in the main program window. The speed at which your computer's fans are rotating, measured in revolutions per minute, is on the left side of the window, while temperatures of various components are on the right side. The RPM data for the CPU fan is listed first, but may be labeled differently depending on the data sent by your hardware.
Step 4
Check the RPM data for your CPU fan and compare it with the normal RPM range listed in the manual or specifications sheet for it. A particularly low RPM number may indicate your fan is failing.
Step 5
Click the "Charts" tab, select "Fan Speeds" using the drop-down menu and place a check mark next to the label corresponding to your CPU fan to begin generating a chart of the variation in the fan's speed. Leave the program running for some time while you use your computer. Later, check the chart; a significant variation in the RPM number, in the order of 1000 to 2000, may also indicate a failing fan.
Testing a Fan Separately
Step 1
Remove the power supply from your computer, disconnecting all cables. If you have access to a spare working power supply, using that one instead will save you the time spent disconnecting it and reconnecting it.
Step 2
Check the power supply for a three-pin fan connector. Many modern power supplies have this connector; if your power supply lacks it, you will need to purchase a four-pin Molex to four-pin Molex plus three-pin fan splitter cable.
Step 3
Bend or cut a metal paper clip to create a "U" shape.
Step 4
Identify the 24-pin main power connector and locate a green wire and a black wire.
Step 5
Insert one end of the U-shaped paper clip into the pin corresponding to the green wire and the other into the pin corresponding to the black wire.
Step 6
Connect the fan you want to test to the power supply using the three-pin fan connector and, if necessary, the splitter cable.
Step 7
Plug the power supply into an electric socket using the appropriate power cable and, if necessary, turn it on using the switch on the back of it. Check whether APPLE CPU Fan on the power supply is spinning to ensure it is on.
Step 8
Check if the fan you are testing is spinning, if it's making any odd noises, stuttering or abruptly changing speeds.
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