Most expensive will be dell or geek squad etc.
Cpu fan failure dell inspiron.
If the fan is not working then i have to assume the system is shutting down as the cpu will overheat.
Locations that charge a flat rate for the job.
Least expensive way is to replace the fan yourself.
The fan you need will depend on your graphics type integrated or amd.
Inspiron 5559 out of warranty cpu fan failure.
Processor fan failed to respond correctly try blowing out the vents with canned air.
Assuming you have the original dell fan it would appear the electronics in the fan have failed even though the fan is working.
If you have run full system diagnostics from f12 and the same error is displayed then you are probably looking at a bad fan.
Desktop pcs have more than one fan processor cpu dedicated or discreet video card gpu power supply psu and one or more chassis case fans.
Your dell pc may contain several fans to keep the internal components cool.