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DELL XPS 15 9560 CPU FAN CONSTANTLY ON FULL POWER

I took out my fans to clean the dust recently. Put them back in and all was working fine. Then the next re-boot I get error code 0511 fans not working. 

CPU Fan is constantly on full power from the moment I turn the device on

Temps ar 38-41degres. CPU is under less than 10% loads. CPU fan is on full power.

Tried Dell Power Manager and Quiet Mode but doesn't do anything. 

All BIOS and drivers are up to date.

So I replaced the CPU fan with a new one. Still the same. CPU Fan is constantly on full power! Sounds like a jet engine take off.

Please help!

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