New 27" iMac ejecting external hard drive and not detecting it consistently

I purchased my iMac from Best Buy two days ago and am wondering if I have a lemon. During the process of transferring files via an external hard drive I have noticed a number of issues. My old 2007 iMac had no problem reading the drive but my new iMac keeps ejecting the disk every couple of minutes. I will get a message in the corner of my computer stating that it was not ejected properly.
At one point, the new iMac would not read the drive at all. I plugged in my iPhone and it detected it at first but eventually ejected it and would not detect it again either, not even to charge it. I restarted the computer and it started detecting the iPhone and the external the drive, but now I am back to getting the same error message. I have tried to repair the disk using disk utility and it does not detect any problems. I also tried using every single usb port.
I would appreciate any suggestions and will be taking it back if it keeps having issues.
New 27" iMac
3.2 GHz Intel Core i5
8 gb 1600 MHz DDR3
Mavericks 10.9.4

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