RE: 3.5 mm headphone jack won't fit in headphone/mic combo jack.
Do I need an adapter for this?
No it should go in. We have been getting reports of tight jacks. Don't know if it's a quality control issue. Try some different ones and insert more firmly than normally.
If none will go in all the way, but you do hear the audio, I wouldn't be too concerned. If not getting audio (the selection popup does not appear) because it won't go in, then contact tech support or send it back.
Jim Coates -- 15 years on the Dell Laptop Audio boards -- since 2/6/04