Wht is my film transport signal not visable on Minolta Dynax 404si?

Can't do that with that model.

I believe the 400si battery cover will fit. See http://uscamera.com/2082-0120.htm

try using a penny

CLICK HERE TO DOWNLOAD THE MANUAL

Push the square button next to the top display panel.

Hello,
Use the regular 35 mm films, if you can find them.
Hope it helps.

I found a manual online that gave the information.

Generally when a camera refuses to take the photo is because you are operating beyond its expected lighting settings. If you are on automatic, it will just flash a light at you, or give you some indication it is beyond the limits of that setting. Try manual, or some other setting like landscape, or backlight. Generally this will happen on automatic settings. 
Film? Try the f16 rule. In broad daylight, the rule is use f-16 and a shutter speed that matches your film's asa. So 100 ASA film? Shoot the sunset at 100th at f-16. Darker, open it up two or three stops. f-11, 8, or 5.6. 
Bottom line, make sure you are on manual. The problem is likely an automatic exposure. 

Best place EBAY but you might have to try different country like UK or CANADA also check the web page of the person doing the listing.More than likely this is the place to find it .I have seen one recently in this location.

You will find a copy of the owners manual available from the website link below

http://ca.konicaminolta.com/support/manuals/film-cameras/film_af_slr/index.html

Yes the camera has a built in light meter the manual will explain how you can use it