My dad recently got a new Canon and gave me his old one - an A620 PowerShot. It picked this very time to start having troubles. The camera came with a 32MB Canon-brand card that works perfectly every time. We also have a Kodak 1GB, a Lexar 1GB, and I believe a SanDisk 2GB (Which my dad currently uses in his own camera). The Lexar and Kodak don't work; occasionally, though, if I format them (to either FAT or FAT32) they will work until I take a picture, then delete that picture on my PC and re-insert the card into the camera. The SanDisk seems to work just fine, and I know the 32MB works perfectly every single time.
Has anyone had similar problems with the A620 or a camera like it, and come across a fix? The cards have no visible defects; the card slot on the camera seems to be just fine. Another interesting fact is that if I lock the dysfunctional cards using the switch, then the camera recognizes that the card is there and that it is locked. It will not, however, recognize any of the aformentioned cards in unlocked mode at all. This problem just started last night. The camera has worked flawlessly for my dad and he has never had this problem. I'm probably going to return the Kodak and perhaps buy a SanDisk equivalent (I've heard good things about SanDisk with regard to memory cards) but before I do that I'd like a second pair of eyes to look at the problem.
Thanks. Help is appreciated, flames are not.

