yeah, the SD card was new and bought already-flashed.
as i have no idea how to run a file system check, i think my only option is to reflash the SD card.
any other suggestions?

Hey everyone, I need some help with my Raspberry Pi. Today I started using my Raspberry Pi. I turned it on, and it booted up normally. I then started programming my own calculator in IDLE (I use Wheezy). I finished the calculator and then shut down the Pi. I then turned the power off. Later, someone...