did you unmute your speakers and PCM?

amixer sset Master unmute

Lets start at the beginning.

1. Make sure you have speakers plugged into the correct audio jack.
2. Check 'lsmod' to make sure all of your sound modules are loading.
3. Check 'lspci -k' to see what kernel module is loading.
4. Is this motherboard chip? Check BIOS!
5. Are you using the stock kernel or did you "roll your own?"
6. Are you using a kernel/alsa package that supports you chipset?
7. Did you make '/etc/rc.d/rc.alsa' executable?
8. Restore everything to default settings, reboot to CLI, and run alsamixer. Make sure NONE of your audio outputs are muted. Crank up the volume of any that are low.
9. If you installed pulseaudio, I swear I'll beat you with a stick! ;)

At the very least, alsa should have automagically set up /etc/sound.conf with:
You need to make sure you don't have audio modules loaded for which their is no hardware installed. AND you need to make sure snd-hda-intel is the correct module.

While still in the CLI (no KDE etc.), run this (example from my Slack14.0 with CL Audigy):
(Note that I have blacklisted HDMI and USB webcam so those won't show.). Hopefully you see a similar list, if errors, then you may have the wrong or bad module installed (or rc.alsa did not run on boot). Now for all regular outputs try each with, for example,
This outputs to "default" 4 channel (front and rear speakers). This will tell you too if you are plugged into front vs rear speaker jacks. I can't tell you how many times THAT caught me off guard! See (hear) which channel works, if any. If you get NO sound an any channel, any errors, you've got something borked in hardware or software. You can try reinstalling the alsa packages, find out what module you need to load, etc.

Good luck!

King that is a wonderful answer truth is that should play right out of the box on a full install. un-mute the auto-mute and in kde go to settings and keep testing till you get them speakers in the right plugins.

Thanks for the answer, but I tried and checked eveything you said and the audio just ain't working, it isn't a hardware problem, I just booted OpenSuse from a live CD and videos sounded pretty well. I'll keep investigating.

I just came with this hypothesis:

First look at this image: http://imageshack.us/a/img692/2626/wy5t.png

That image was taken from Phonon, as you know it's the Mutimedia framework of KDE, so only native application (QT) are managed by it (I don't know if this is 100% true, maybe I'm saying a nonsense). The fact is that Amarok "follows" what phonon says when setting sound devices, and if one doesn't work, it tries with the next one, and as you can see, DEFAULT shows error when tested... but since it's at the bottom of the list, it has shown no problems, that's why Amarok is ale to play. BUT NEITHER OF THE VIDEO PLAYERS I HAVE ARE QT NATIVE, THEY ALL ARE GTK, SO PHONON DOESN'T MANAGE THEM, BUT ALSA DOES, AND ALSO THE CONFIGURATON SETTING OF EACH PROGRAM, AND ALL THIS TIME I'VE TRYING TO SET THE "DEFAULT" DEVICE AS THE DEFAULT DEVICE (sorry for the repetition), THE SAME ONE THAT PHONON PROOVES DOESN'T WORK, SO I'LL TRY THESE SOLUTIONS:

-Download a native KDE video player that supports PHONON and see if sound works.
-Replace in alsa the "default" card for one of the " HDE Intel PCH" ones.

For the last one I need some help, since I don't know how to do it, could somone explain me please?

asero12,
If you go to the top of the audio list "reproduccion de audio" and make sure the working sound devices/channels are at the top of the list, then ALL KDE apps will use those sound outputs. Kplayer "should" pick it up if "output driver" set to "Auto". Otherwise, set to alsa, and pick a matching output device that works. Or, on mplayer, go to its configuration and from the "audio' tab and do the same thing.

Again, if "speaker-test" did not give sound on some or all channels, clear out all custom settings, reinstall the ALSA package, chmod +x /etc/rc.d/rc.alsa and reboot to try again. Speaker-test MUST work on valid analog output channels found with 'aplay -L" This shouldn't be difficult. I haven't had issues with Alsa on intel chipsets and Creative Labs cards in many years.

On you Slackware DVD/USB nstall media (example for Slackware64 14.0) reinstall, as root,
slackware64/ap/alsa-utils-1.0.26-x86_64-1.txz
slackware64/l/alsa-lib-1.0.26-x86_64-1.txz
slackware64/l/alsa-oss-1.0.25-x86_64-1.txz

with "upgradepkg --reinstall <package-name>"

Problem got fixed fellas.

I tried with speaker-test -Dplug:default -c4 -twav as kingbeowulf said,
but it didn't sound... so looked up for the name's of the other devices (default, front, hdmi, etc)
and tried with front. it sounded, so I opened /etc/asound.conf with nano and replaced all the defaults for fronts like this:


and videos are sounding now.


Thank you very much for the ones who helped me with this problem. ;)

Someone read the arch wiki on ALSA