How do I find out what's wrong with my sound card?

I just tried to watch/listen to a video on Youtube and no sound was produced. I tried multiple other vidoes and the same thing happened. Then I opened Spotify to see if that would work, and it didn't, but it said that something was wrong with my sound card. I'm not sure exactly what that means, so if someone could potentially help me that would be great! My pro is about 8 months old so it should be having all these malfunctions (there have been others...)
On a side note, iTunes wouldn't even open due to "an unknown error".

Try these:
for some of your issues, open disk utility and verify your disk permissions - repair if needed. might take an hour or less depending on how much errors needs to be repaired....once done, restart your macbook....
for your sound issue - do a PRAM/NVRAM reset....
good luck....hope you get it sorted out....

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    Votes 1
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    Category java:runtime
    Reported Against 1.4.2_05
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    JVM: Sun 1.4.2_05-b04 64-bit server VM
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    xxxxx@xxxxx 10/5/04 20:02 GMT
    Work Around N/A
    Evaluation Post tiger
    xxxxx@xxxxx 2004-09-02
    Comments
    Include a link with my name & email
    Submitted On 05-FEB-2005
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  • I recently bought a macbook pro retina and while I'm using it a yellow triangle pops up then disappears. I don't know what it says. How do I find out whats wrong?

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