auto focus does not work

I did have a d70 and all auto focus worked on all lens. I just got a d3100 and only the lens marked af-s nikor worked. the others do not have the af-s marking..they are a quantray 70-300 and tamarand 28-200. the auto focus motors worked on the d70, but not on the d3100. the only way I can focus is manually...is there a command on the d3100 that is missed or do I have to replace the other lens with af-s nikor ..how can I get these lens's to wokr
Kaschiro

The D3100 will only auto focus with AF-S lenses. So you have to sell those and get AF-S lenses or put up with manual focus. Or buy a camera body that has the internal focus motor such as the D90, D7000 and D7100.

The Nikon D70 has an internal focus motor, the D3100 does not.

...

Thank you for your input...well that answers my questions...now I have to look for af-s lens or go back to my d70...but on the other hand manual focus is not that bad, just got the camera yesterday so I am going to play with, at least the one af-s is a 18- 70 mm and the one that came with camera is 19-55 and both of them are nikors
Thanks,Kas

D7000 or D90 would focus your existing lenses and give you better high iso performance than the D70 did.

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