All might not be lost with the uSD card. Download a fresh copy of Noobs, or better, Raspbian-latest from the RPi org site above. Verify the downloaded .zip file against the published sha256sum for your download and then use the free utility Etcher to burn the uSD card. Etcher will do it all...unzip the file, partition the uSD and burn the image to the card. If it completes without errors, put it in the RPi and apply power. Keep in mind, you should always use a proper shutdown procedure before disconnecting power or removing the uSD card...failure to do so invites corruption of the uSD card.
Still, get another uSD card (8G or larger, class 10 from a premium mfgr. and source...no auction sites) and burn the above download to it. If both work, you have a spare.