I have to reinsert my seagate backup disk to another USB port on every reboot!

I have a late-2011 MacBook Pro 15" and i am using Seagate 1TB expansion drive with time machine. I keep it connected to my macbook all the time but the problem is on every boot of Mac i have to remove the drive, reconnect it to other USB port for it to show up in Finder or use it with time machine. Why wont OS X detect it if i just leave it connected to a USB port? I have OS X 10.8.2 installed. Is connecting USB 3.0 device to USB 2.0 port causing problem? My mac doesnt support USB 3.0! Any suggestions?

Incredible as it may seem, the brand new cable is damaged and dead. Given that it IS new, take it to an Apple Store for replacement.
Or just buy a replacement outright if you're rich and not up for the haggling exercise of convincing the Geniuses that their brand new toy came defective from the start.
The new Lightning cables seem to be quite a bit more fragile and delicate than the old ones.

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