Dell inspiron 7500 fan and freeze trouble

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i have a laptop DELL inspiron 7500 p3 700mhz and i have another
mainboard with 500mhz that i bought on ebay in good condition. but
the trouble with my old board is: when you turn on the laptop, its
work nice but the fan stop, and then in a few minutes the laptop
begin to get freeze, if you turn off and turn on again the laptop get
freeze even in the bios in all parts just get freeze and if you open
it you can see that the laptop is very hot and i dont know why the
fan turn off, when i bought the new board i put it on the laptop and
i get the same trouble, im just ask if anybody can help me to saying
to me what does that the fan goes out, and sorry becouse my english
is not good. thank you.

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