Question PC fan going really fast then pc shuts off

Jul 24, 2020
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So i took some parts out because i’m trading my gpu, but once i put everything back together and i turn it on, everything seems fine but then either my cpu fan or something goes insanely fast then the of powers off and i have no clue what to do. I made sure my cooler was perfect in its position and i checked my gpu, both were fine i just can’t find what’s causing my cpu fan to go really fast (like it’s realllllllyyyyy fast) then pc shuts down.
my specs:
Intel Core i7-920
Nvidia GeForce GTX 660 TI
19gb ram
 
Jul 24, 2020
5
0
10
i did remove my cpu fan and checked out and cleaned some dust then once i put it together, i would start the pc and the cpu fan would go insanely fast then it shuts off. thanks for the reply i’ll try to reapply some thermal paste