It can not be the card, there is nothing there that could alter the information. It is either readable or not, but color can not be changed.
all the steps described above are good common logic, unless you rigorously follow them, you won't know for sure, and there is no need to find someone who can look at your computer until you know it is the culprit
and if i can suggest, don't try to remember if it was or not red on the display, just shoot a few photos and you will know for sure
and if your D700 is the culprit and shoots too red consistently, there is a menu item where you can correct it to be right, but you must have a way to verify that it is your camera, and nothing else before you modify it