sound

[stan]

On Mon, 13 Feb 2012 18:42:18 +0000 (GMT)
Patrick Dupre <patrick.dupre at york.ac.uk> wrote:
...
> aplay -lv
> 
> aplay: device_list:252: no soundcards found...
> 
> This is bizarre, to tell the true, this card had been recognized last
> week, and I tried to test it. I did not get it working, by
> disconnecting the cable, do you think that I may have kill it?

You don't say what kind of card or system.  But if it sits in a slot, I
recommend that you remove it, dust / clean it, and reseat it in the
slot.  While you have it out, take a look at it for damaged components.
I have never experienced a problem from plugging / unplugging a cable
from a hot card, though it is probably best not to do that. However, the
mechanical action of pushing the cable in could have displaced the card
in its slot. 

> There are probably some tests that I can run.

Alsa is low level; it is assigned devices by the kernel which scans to
determine hardware.  If the kernel doesn't find the device, it is
unlikely any other test will.