I shall get one of those fans, if not too expensive :)

Thanks for your help

eMicros

Genuine Dell NY290 Hard Drive Blower Fan and NH645 Hard Drive Caddy, For The Optiplex 740, 745, 755, 760 Small Form Factor (SFF) Systems, Compatible Part Numbers: TJ160, NJ793

Genuine dell ny290 hard drive blower fan and nh645 hard ...

Genuine Dell NY290 PC Blower MCH Fan For Optiplex 740 745 Hard Drive Bracket Part Numbers TJ160 / NH645  

Genuine DELL Hard Drive Blower Fan Plus Hard Drive Bracke... 

Hi eMicros,

I'm glad we could help! If you've got any further problems, please don't hesitate to get back in touch with us!

If you do not have a fan connected to rear fan connector you will get error msg

A fan MUST be connected to rear fan connection on MB

Hi eMicros,

Sorry to digg out this old thread of yours.

I have exactly the same problem with you. old Dell optiplex, recently upgrade to win 7, get error message "rear fan failure", press F1 to continue without a problem..

Can i ignore the error message (press F1 everytime i start up!!)  and live on with my life ? Or this is the real hardware issue that i need to replace the fan  to prevent overheating in the future ???

Thanks!

I have the Optiplex 755 USFF. I've received the Rear Fan Failure alert intermittently in the last 7 days (3 times). Is the fan on the hard drive caddie the rear fan? Also, any advice on whether I should replace now, or should I check something before replacing? I ran diagnostic and no problems were indicated. Every time I got alert, I restarted and didn't get new alert. Haven't done any work on the system for over a month (added RAM about 30 days ago). Thanks!

The USFF rear fan is on the hard drive caddy.

Dell Optiplex 745 755 Hard Drive Blower Fan HK120 HK253

Replacing a Hard Drive Fan

1. Follow the procedures in Before You Begin. 

   <ADMIN NOTE: Broken link has been removed from this post by Dell>

   
   
   
2. Remove the computer cover (see Removing the Computer Cover).  

   <ADMIN NOTE: Broken link has been removed from this post by Dell>

   
   
   
3. Remove the hard drive (see Removing a Hard Drive). 
   
   
4. Turn the hard drive upside down, so that the hard drive fan is visible in the bottom of the drive bracket. 
   
   
5. To remove the hard drive fan: 
   
   
   1. Lift the release tab on the back panel of the fan. 
      
      
   1. Rotate the fan in the opposite direction from that indicated by the arrow on the back panel of the fan. 
      
      
   2. Lift to remove the fan and its back panel from the hard drive bracket. 
      
      

Replacing a Hard Drive Fan

1. Follow the instructions in Before You Begin.
   
   
2. Remove the hard drive (see Hard Drive).
   
   
3. Remove the hard drive fan:
   
   
   1. Remove the screw that secures the fan release tab to the hard drive bracket.
      
      
   1. Press down on the fan release tab, and then slide the fan towards the front of the computer so that its side tabs are free of the corresponding slots in the hard drive bracket.
      
      
   2. Lift to remove the fan from the hard drive bracket.
      
      
   3. Unplug the fan.

I have the same error, but the fan is working. In fact, there is something wrong with the fan, it never stops working!! But, I get the same error of no rear  fan detected

This thread has been locked due to it's age, if you have a similar issue, please use the 'New Post' feature at the top of this page and start a new thread.
  
Bev.