Fan spinning fast with noise

Hi!
I have HP Pavillion dv5 notebook.  i have a problem with the ventilation fan. sometimes when i move my laptop (for exemple if i tlift it from the table to put it somewhere else) then the fan  starts to spinn with an extremly high speed and it sounds very noisy,  this condition doesn't stop until i turn off the computer. This happens too sometimes when i start my computer, i had to start again, to make it sound normally.
I don't know what is the cause of this?
What should i do to fix it?
I would appreciate  if someone helps me with this, thanks in advance.

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