Mac Mini sound mid 2007

My mac mini does not have any sound when booting nor in applications mid 2007. Could someone help me...

If you go to System Preferences>Sound>Output what is listed?
Do have any external device conected to the speaker-out jack?
Did it work before?
Try resetting the SMC and NVRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
About NVRAM and PRAM

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