Short answer off the top of my head: it's almost definitely not ruined. You didn't provide a lot of detail, but this doesn't seem unusual to me.
Some questions if you want to discuss the situation in more detail: what was your recipe, including what kind of yeast did you use? What temperature has it been stored at? Has the temperature fluctuated or has it been reasonably constant? Was there a fermentation trap on the carboy and if so, has it been bubbling at all over the past 8 months? What is the history of your hydrometer readings, if you've taken them and kept track?
Then, about the mead itself: is it clear, or cloudy? Is there any kind of visible crud on top? And -- what does it taste like?
My main concern, depending on the type of yeast that you used, is that it's been stored in a closet in Louisiana all summer long. Depending on the yeast strain and the actual temperature, you may have exposed the mead to more heat than is desirable. That might result in some off-flavors which may require more aging, but unless something else went wrong too, it shouldn't ruin the mead.