After 37 years of not being one, I'm now a Middle School Science teacher again. Been challenging to say the least. Anyway, as I was going through lab equipment in the lab, I came across an older Rebel XSi. I charged the battery, everything fires up, but when I put an SD card in I always get an "card write protected" warning. This is regardless of which way the switch on the SD card is in. Anyone got any ideas on how to correct this?
Not sure why the camera was there, hasn't been used in years. Has the 18-55 and 75-300 kit lenses with it.

