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Make sure the on-board audio is enabled in BIOS. Apparently someone else had that same problem with the 745.   Lots of suggestions here including manually installing the driver from the INF. Make sure you have a sound device actually showing in Device Manager, even if it's yellow-triangled out. M ost Vista drivers for older systems I've used seem to work fine for the same architecture of 7/8 although sometimes I need to coerce them to get past the OS version checks vendors have been putting in lately.

MShoultz1 wrote: Yea, positive it's not muted;) I've uninstalled and reinstalled 2 sets of drivers. The R243724 and R243725. The 25 is the Vista 32/64 bit drivers. Also using the Dell AX510 Soundbar if that helps any. I'll try by Service Tag on the Dell site. If you've used different types of speakers/headphones, then it's not those devices. It's either your driver or the physical port.

I'm leaning towards the port from what you've done already. Does Windows show the typical slider bar for volume or an X or something else? If it shows the normal volume slider, then Windows sees the driver. That would almost certainly narrow it down to the port. The Procedure Entry Point Symsetsymwithaddr64 Dbghelp.Dll. BUT, it is 4 o'clock here, and I could be missing this late in the afternoon.