Blinking circle with black dot - 400si

It uses a 2CR5 battery, which should be available at most electronics or office-supply stores. An online source is at http://www.batteriesplus.com/product/31018-RAYRL2CR5--1-Lithium-Battery/563-0/4739-Film-Camera-Battery/56279-Minolta/Maxxum-400si.aspx

It has a Minolta A-mount lens. Any of the newer Minolta (and some Sony) lenses may be used. The older Minolta lenses for the SRT-series cannot be used.

link to your manual, it tells us that we have a winding motor problem, I would do as you have done, so I would ensure that batterys are in great shape, the only other thing I could suggest is to try to turn the winding motor by hand in case it is just locked up. Failing that I presume the motor has died and needs replacement.

Is this an auto focus lens? Most shift lenses are manual focus. Also, because they shift, they can generally only be used on manual not he auto settings. If the contacts are not on the back of the lens then it will on communicate with the body

You can get rechargeable CR5 battery and you will need a battery charger as well.
Check out this WEB site.
http://www.nextag.com/cr5-battery-rechargeable/shop-html

You may download a copy of the manual from here.

The Maxxum 400si is an interchangeable lens camera, so there is no single lens for it.

If you're asking about the mount, it uses the Minolta A-mount so all such lenses, including current Sony-mount lenses, will fit on it.

If you're asking about the lens focal length, Minolta has made lenses ranging from 16mm to 600mm. These lenses vary widely in size (and weight and cost). The filter size also varies from lens to lens.

Or were you asking about something else?

My daughter took the camera to her photography teacher he was able to load the film by wrapping more film around the roller. It's not as easy to load as my Canon. I thought we had put plenty of film around it already. Oh well, it's working anyway.

Here you go:
http://www.nodevice.com/user_manual/konica_minolta/film_cameras/dynax_500si_maxxum_400si_rz_430si_450si_alpha_303si.html

Sorry, the mounts of Minolta manual focus lenses are different than their auto focus series. Sigma, Tokina and Tamron all make compatible zoom lenses to fit the Maxxum series cameras

I had the same problem. Went to a camera repair store and they said that the electronics needed replacing. Expensive. He suggested I buy a minolat maxxum 7000 on ebay, cheaper, better camera and accepts the lenses from your 330si