I have tried buying several different connector cables to upload my pictures from my Canon Powershot SD400 to the computer and nothing will work. Would appreciate any help!
Try NOT connecting your camera to your computer.
The best way to download pictures from your camera to your computer involves removing the memory card from the camera and plugging it into a card reader (either built-in to the computer or connected via USB or FireWire). This is likely to be faster than connecting the camera to the computer, and won't run down your camera's batteries.
Once the card is plugged in, it will appear to your computer as a removable drive. You can use the operating system's drag&drop facility to copy pictures from the card to the computer's hard drive, the same way you copy any other files. Or you can use any photo cataloging program such as Picasa.
SOURCE: as a webcam
No I am afraid you cannot use this as a web cam. I have asked Canon about this and they said that it isn't capable. Sorry
SOURCE: Canon SD400 Powershot wont turn
I read a part solution on your web site about my Canon sd400 failing to start. The message gave a few free words about a micro swith in the cover. I couldnt find it! I called Canon tech and they said there was jo such switch. I packed up the camera and sent it off for a fix and a free firmware update. Probably going to cost $80. But I think it was the right thing to do!!
Ian
SOURCE: Hi. My Canon Powershot sd400
Hi!
You have to unlock your memory card. All memory cards have this small lock mechanism on the side. 
Make sure that the slider is on the UNLOCK position. If it's already on the UNLOCK position and you are still getting the same error message, try to set it to LOCK, then set it back to UNLOCK position.
I hope that helps.
Good luck and have a nice day!
SOURCE: Canon Powershot G3
Actually, you don't need software for an USB cable too. If you have Windows XP, it sees your camera right away and would ask you what to do with that device.
SOURCE: I bought a 4g SDHC card for my camera canon powershot sd400.
Well, first of all, I'm not exactly an expert on this, so please don't rely solely on my response.
It's possible that it needs an SD card, not an SDHC card. SDHC cards are high capacity, and some cameras just aren't able to use them because they're set up for the plain SD cards. Does it say what kind it needs in the manual? I think, if it's an older camera, I'm not sure what age exactly, they can't use SDHCs. Like I said, I'm not an expert, so you might want to get more info, if you can. Hope this helps.
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