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I was given a HP dc7100 to repair. The hard drive was kaput. But I noticed that the fan was screaming,
meaning the CPU is hot. Now it has a heat-pipe cooler with the fan perpendicular to the mainboard.
Also there is a shroud between this heat sink and the rear case fan, presumably to get the warm air
from CPU out. The case fan blows out, as is normal. But the CPU fan is blowing air forwards, i.e.
it is fighting the case fan!
Somebody in the Foxconn factory has fitted the fan wrongly.
