well I'm sorry for that.Intel R Celeron R 2.26ghz..Windows xp service pack 2.I had seen legacy audio driver.Yes it is correctly plugged in.
Intel R Celeron is not a make or model of PC and is totally useless information.
If this is a name brand (Dell, HP, etc.) then please provide the full model #. If it's a generic then the motherboard model # is needed.
If an add-on sound card what is the make/model?
Which jack is the speaker connected to (what is the label next to the jack)
I assume you've checked the mixer and made sure that the output isn't muted?