4: Intermittent

Step 1 - 3:

Step 4 - 5:

Step 6:

Step 7 - 9:

Step 10:

Step 11 - 12:

Step 13 - 14:

Step 15:

Step 16:

Step 17 - 18:

Step 19:

WARNING: When performing any of the test steps, always be aware of hands, clothing or tools near Cooling fans or hot surfaces.