If you find that your laptop turns on and
everything is working fine, except that it makes noise constantly, it could be
due to due to the fan failing to work. Or it
could be a problem from the hard drive. Back up your files and replace your
hard drive.
Alternatively, you can remove the hard
drive and start the laptop. If the laptop still makes noise, it's probably due
to the problem of bad fan.
You have to replace the fan.
If you can't do it, see the laptop
repairer.
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