Hi,
Can anybody advise on my poor DELL Inspirion?
The fan is on all the time, very loud, the CPU load is 100% most of the time,
resulting everything works very slow.

Temperature of the CPU is shown constant 85 degree, way too high,
but doesn't look like, I've cleaned up all vent holes with compressed air,
and the air comming out is cool. Also 85 degree is shown immediately after start, which is strange too.

I run diagnostic utility and "Fan problem and overheating" test.
Got that error message on CPU thermistor, Video Thermistor, SODIMM Thermistor:

Error Code: 3900:0626
msg: temperature sensor out of range temp 255C, min 10C max 100C

and on Processor Fan and Video Fan On/OFF test I'm getting system shutdown.

is it processor or thermistor?