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14

The fan inside the system unit should make a low, steady sound 
when operating properly. If the fan is totally silent: 

 

Check that the system power cord is securely attached to 
the back of the system unit and to a power outlet. Verify 
that the outlet has power. 

 

If possible, substitute another power cord that is in good 
working order. If the substitute works, replace your 
power cord. 

If the fan makes excessive noise: 

 

Turn off the system, open the system unit case, and 
inspect the fan for any obstructions. 

 

Turn on the system and listen closely to the fan. If the 
noise comes from inside the fan housing, your power 
supply may need replacement. 

Your hard disk should make a slight whirring sound when 
operating properly. If the disk is totally silent: 

 

Turn off the system, open the system unit case, and check 
that the power cable between the power supply and the 
hard disk is securely attached at both ends. If it is, your 
hard disk may be defective. 

If the hard disk makes excessive noise: 

 

Turn off the system, open the system unit case, and 
remove the hard disk power cable connector from the 
hard disk. Then turn the system back on. If the noise 
disappears, your hard disk may be defective. 

 

If you have more than one hard disk, repeat the same 
procedure for each disk.