Help!Laptop fan starts low then goes full blast & unexpected shut down

[george_geo]

Hi all,

I have an Asus K55VD-SX438D, i7 3630QM 2.4GHz, 4GB DDR3, 750GB, nVIDIA GEFORCE 610M - 2GB.

It starts well, fan runs normal then suddenly goes full speed and randomly shutdown: Event ID 6008.

Checked fan, heat sink, all very clean. Replaced CPU/GPU paste but nothing seems to work.

BIOS is up to date (v411) and no options at all to see/adjust fan settings.

When idle, SpeedFan and HWmonitor reports quite same values: 50C -ish and fan speed 2200rpm -ish.

When fan goes full blast, SpeedFan reports 50C -ish and fan speed 4200rmp -ish. HW monitor reports quite same temp but indicates a speed of 25500rpm which is unreal. Software bug or wrong data?

Now, you might rush to say "CPU overheating". Ok, I thought the same so I installed HeavyLoad stress tool and let CPU to reach 90C. It stayed like that for several minutes and no unexpected shutdown. Stopped the CPU stress test, temp dropped, fan still running full speed. Then BANG! Shutdown!

I have replaced the HDD (Win 8.1 Pro) with another HDD (Win 7 Pro). Same thing.

I have removed the HDD at all and run Knoppix from DVD. The fan still behaves stupid but no shutdown anymore (yet).

Even if I am just in BIOS (no HDD installed), the fan still goes crazy.

What can be wrong?

Thank you!

 

[hang-the-9]

Try with different RAM. Issue could be the motherboard, and possible the CPU but CPU failure is pretty rare. I'd go with a motherboard replacement before a CPU one.