I have a HP DV6000 laptop. It's a little over a year old with some wear and tare. The sound is lagging, but I know the cause is not my speakers because the sound lags on my headphones as well.
It will sound ok for a little bit then lag for a little then go back to normal and repeat every few minutes.
This has been happening for a few months, now sometimes if I put my computer on standby and try to listen to music when I log back on there will be no sound and I have to then restart my computer for sound to play.