Artifex Maximus <artife...@gmail.com> writes:

> I've changed my processor from E5200 to E8400. Since then my computer
> does not shutdown.

It's possible that you damaged your board in the process.

> Sometimes the display and motherboard LEDs become blank but PSU cooler
> runs.

It's a feature of some PSUs to leave the fan running until they have
cooled down some after turning off the computer.

> Sometimes Debian stops at System halted line and no blank screen and
> machine keeps running.

At that point, your system is shut down and the only thing it doesn't do
is turning itself off.  That can be a software issue --- I never figured
out what kernel modules are needed for that.

> I think that only CPU change cannot made such problem. I tried BIOS
> default setup loading but no change. Any idea what to change? I have
> no idea.

You could start by looking at what's in syslog and dmesg and by checking
the loaded modules.  You could boot from a live/installer DVD/CD and see
if the computer turns off when you shut it down to get an indication if
there is a software or a hardware problem.  I don't know if the DVDs/CDs
actually turn the computer off, though, something to find out first.


-- 
Debian testing amd64


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