DiskGo Edge External Hard Drive Problem

I purchased an external hard drive used at a sale...it was working fine, then I turned it off & back on again (was having trouble getting my trash to delete). Now my eMac will not recognize it at all, and the red light is on the external hard drive. Is it dead? I really don't know, I didn't get an instruction booklet with it, and couldn't find anything online. Please let me know if there is anything I can do to get this started again...
Thanks,
Sarah