A few days ago I bought a new hard drive and I installed Windows XP Professional. I have a Dell Poweredge SC420 with all of the original components except the hard drive. Everything works fine except there is no sound coming out of my speakers. I have checked the Device Manager and the "Multimedia Audio Controller" along with the "Video Controller" have big yellow question marks next to them. How would I be able to fix this problem? I know that everything is plugged in how it should be and I did not have this problem before I bought the new hard drive. Please help? Thanks.