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bearings are dry and noise is metal on metal you can try to oil/lube the bearings --and or a blade is rubbing on case either loose blade or bearings worn causing offset wobble
It sounds like they are very dusty. First try (if accessible) blowing them out with an air can. If not, take to a computer repair specialist and have them diagnose it.
Download the program (freeware) to find your driver at http://driveridentifier.com/.Instal that program and let it to scan your pc and finally find the appropriate driver.
Is it a clicking noise? Hissing noise? or maybe a grinding noise? A pc can cause many different noises. A clicking noise generally means the hard drive is failing. You'd want to back up your data immediately and get a new drive. Hissing can be a bad fan or CD/DVD drive that needs to be replaced. Grinding noises can also be caused by fan bearings going out. You would need to find out which fan it is, and replace that fan.
Try cleaning out the fans before going to the bother of replacing it. There maybe some debris stuck in it causing the strange noise. A can of compressed air often removes most of the dust and debris but on occassion it is necessary to open the case and manually clean the fan.
Generally if its grinding and clicking noises it will be the hard drive the fans will cause more a whirr than a grind
Grinding noise in tower If everything on your computer is working fine then it is probaly a fan put your ear in the back of your tower near the power cord and see if you can hear the grinding noise better if you can then your power supply's fan is going out if not its probally one of the inside fans in your tower open up your tower and see if you can find which fan it is if you dont want to do this you should probaly get a tech to look at it it's a pretty cheap fix and it can save your computer from heat dammage
The fan rotor is stuck due to accumulation of dust. Take out the fan and clean it. Put a few drops of alcohol or lacquer thinner on the rotor/bushing assembly while manually turning its blades to loosen the hardened dirt until the fan freely spins like the good one. If it does not work, replace the defective fan if spare is available.
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