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HP Recommended
Pavilion zd8000
Microsoft Windows XP

I have an HP Pavillion zd8000 with windows XP. I had the issue of overheating so I decided to take it apart in order to clean the cooling system. Got everything cleaned and added new thermal paste. The original was dried out. I put everything back together. My laptop now runs around 55 Celcius.  Before it run around 65 Celcius.  The issue I have is that the center fan doesn't turn on. It used to turn on before me cleaning it. I thought maybe the fan is broken so I got a new fan. I installed it but still doesn't turn on. Is this fan supposed to turn on at certain temperature, or is it supposed to be on all the time like the other two? Because this fan is not on, the center of the laptop feels hot while the left and right feel cool. Any help is greatly appreciated,  thanks!

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