Sigma makes lenses with a variety of camera mounts. A lens with a Pentax mount, for example, will not fit onto a Canon camera. Assuming you get the lens with the Canon mount, then it will work on the EOS 350D with full functionality.
SOURCE: Sigma 70-300mm lens not fitting Canon EOS 350D
Are you sure you bought a lens with Canon AF mount? To me it sounds like you got one with a mount for a different camera.
Does the mount on the lens look like this?
If it doesn't, you got the wrong version of the lens. If it does look like the mount in the picture, your just mounting it incorrectly.
If you hold the camera with the lens mount facing you, the red marker on the lens should be in the 12 o'clock position, lining up with the red marker on the lens mount on the camera.
The turn the lens clock wise, about an 8'th of a full turn, and the lens should click into place.
I hope this help you!
/Chris
SOURCE: using a 70-300mm sigma lense on a canon 350d i error 99 flashes
Error 99 usually refers to a shutter error with the camera. It is most likely not your lens, but you can try it on another body just to be certain. Try PhotoTech Repair Service, in NYC. They are an authorized service facility for Canon cameras. Also if you join they're facebook discount, they will give you 10% off the repair.
Here is the link to the facebook page, it has everything you need to send in your camera.
http://www.facebook.com/pages/New-York-NY/PhotoTech-Repair-Service-Inc/102527215194
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