I have a Canon Powershot S400 4mp camera
The camera has a known problem with a memory card error and mine had it as well a few months ago. I took out the internal battery, reinstalled it which took about 5 minutes and it has been working fine again for months
Canon has a recall for the camera as well so if you felt like it you could send it to them and get it fixed free of charge, but I dont think it would be needed
I will include a 64mb compact flash card with it along with the accessories that came with it
$100 Shipped