Ok Here goes, Acer E380 with Dual Boot, XP (sp3) and Vista (sp1), onboard sound Realtek HD Audio All was working fine on XP (XP is the default OS) until yesterday, when the Realtek HD control panel kept popping up stating a new speaker had been plugged in (it hadn’t the same speakers that Ive been using for the last year hadn’t been unplugged and were still plugged in, rear sockets) this message kept popping up every 2 mins or so, sound was still working. Anyways I decided to unplug the speakers and plug em back. That seemed to sort the problem until the next reboot when I lost all sound. I have a dual boot with Vista so tried Vista and sound ok, no problems. Back in XP still no sound, unplugged the speakers to the front socket, had sound ok, plugged back into the rear socket no sound again. Checked the Realtek HD panel and according to that no speakers are plugged in !! Anyways searched Google and decided to try updating the drivers which I did but still no luck. Tried a new set of speakers, no difference When back to Vista and now Ive lost all sound there aswell. Ive checked everything I can think of, control panel, device manager all looks ok nothing is muted, nothing disabled. As far as I remember the last update I did was just after SP3 came out but that was 6-8 weeks ago, nothing else has been installed or updated recently so im completely lost with this one. Any help greatly appreciated Edit :- I have also checked the BIOS which was ok, but i then disabled the onboard sound rebooted, enabled it again, rebooted but still no difference.