Speaker volume is too low, even though all volume controls are at maximum level. I checked speaker cable connections, which are fine. Not a speaker problem, as the speakers work great on another computer. I am running Vistaoperating system. Any ideas on how to fix this problem? [after searching the boards, I note that Mgreeley1 posted solution to speaker volume issue on XPS running Windows XP on 4/15/08 as follows: "went into Bios today and turned off the onboard audio controller and it now works great!" --- will this solution work for my Vista system? If so, how do I access the onboard audio controller?] Help, please!