What model is your computer? There is something wrong for sure. Sounds like the tech put the fan back in backwards.

Only a 4700 will have air blowing out the front, and it won't be cold.

 

Call tech support with the "won't turn off" problem and mention that since it was worked on the fan doesn't run right.  They should send a tech back out, hopefully one who knows which way the fan goes in.  Dell's subcontracted 'field techs' can vary from knowledgeable, to deliverymen with screwdrivers.

:smileysad:Thanks for that just got in touch with Dell done a couple of tests and it seems i,ve got a faulty CPU fan it,s now

3 hard drives

3 mother boards

1 power supply

1 cpu fan

 all in 2 and a half years,

that to me does not sound like good components at all.

The diagnostic bot does not have an entry for 'fan blows out the front'.  It does have an entry for 'fan trouble' and the first answer is always 'replace fan' (they're cheap).  Replacing it is probably not necessary--it is not possible for this type of motor to spontaneously reverse itself--but it gives the 'technician' another opportunity to put it in the way it belongs.  And Dell 'home techs' are only dispatched to replace parts.

 

Computer components are rated for 50,000 hours of continuous operation which works out to about 6 years.  The rating itself hasn't changed.  What's changed with intense cost cutting in the industry, is how many components fall outside the bellcurve of that rating and fail prematurely. 

 

All your replaced components may not have been defective, any more than your CPU fan is now.  But yes, cost-strained ($400 ~ $700) desktops don't provide the troublefree service that the comparable-performance box did in 1998 when it cost $2000.