I have a Vaio Cr 220 laptop running vista, and it has the annoying habit of not producing any sound sometimes when I dis/reconnect the power cord. Also, for some reason the startup sounds always work, but sometimes they cut out about 30 seconds in. The device manager says everything is working, and my sound drivers are up to date. It generally fixes itself with a restart, but that gets really tedious to do everytime I move my laptop. I disconnect my laptop fairly often and it gets really annoying to watch youtube videos etc w/o sound. Someone said this is a common problem, any known fixes?