02-09-2012 08:37 PM
a few days ago, when I tried to boot my T400s, I got a "fan error" message.
The fan starts up the moment I press the power button and then abruptly turns itself off after a few seconds.
No start up.
I thought: "fine, I need a new fan", ordered one, installed it without any problems according to the hardware manual (including diligently applying thermal grease).
When I tried to start again, exact same situation.
I can force my computer to start up by pressing ESC when the fan error message appears and it will boot, but the fan is making rather strange noises, namely starting up and shutting down immediately, and starting again and shutting down again [indefinite loop]. I don't like it!
The fan replacement did not do anything for me and I don't have warranty any more. Any thoughts? Is this a BIOS problem maybe? I don't really know what I am doing here. Would appreciate any suggestions!
02-09-2012 09:37 PM - edited 02-09-2012 09:38 PM
It is hard to diagnose from 3000 miles away, but it sounds to me like the circuitry on the motherboard that counts the tach pulses from the fan has died. If it were mine, there is one thing I would try. I would reset everything. Make sure you have cleared supervisor (bios) and power-on passwords first. Pull the AC adapter and battery. Disconnect the CMOS battery. (note that this will cause you to lose your date and time, and any changes you made to default BIOS settings. I don't remember about that model, but you may lose stored fingerprints) With no power and no cmos battery, push the power button a few times and hold it for 5 seconds. Put it back together and pray.
02-10-2012 03:02 AM