The HP part number of the cooling fan is 680551-001 & for while fan/heat sink assembly(includes replacement thermal material) please refer to Page 22, 23, 81 - 83 of the manual after verifying the specs of your product.
You have to test the hard drive & memory - both quick & extensive test to rule out hardware problems before going ahead with fan replacement. Also update the BIOS & drivers of your laptop from the website I have posted above.
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