I am a new user with the Raspberry Pi. I just tried to boot it up for the first time. When I try to choose Raspbian as my OS I get an error message:
"Error writing image to SD card
dd: /dev/mmcblk0: Invalid argument"
Can anyone help me out with this? My SD card came with NOOBS already on it, but I also downloaded it and installed it manually (which was dumb) not knowing I already had it on the card.
Thanks for your help,