Logic: When recording audio, a loud electronic buzz happens

I am using Logic 9 on an iMac.

I use Logic to transfer records and create MP3s.

The record player is connected to my stereo receiver, the receiver to the input of an MAudio FW 410, the MAudio FW 410 to my external hard drive, and my hard drive to my computer (I connected the FW 410 to the hard drive because the FW410 does not have firewire 800, so I connect the FW410 to the hard drive then use the hard drive's FW 800 to connect to the computer)

This setup has always worked fine until recently.

When I transfer my records, Logic stops recording after a few minutes in, and a loud buzz is generated, and I can see the wave form of the buzz where I should be seeing the input of the audio from the record.

I then disconnected the record player to see what would happen and to eliminate the possibility that the record player was the cause of the problem. With the record player disconnected, I still got the buzz simply by arming the record button on the Logic track.

Then I tried transferring the record into GarageBand. The same buzz happened simply by arming the record button in GarageBand.

There seems to be something going on with my computer in regards to inputting sound. I'm not sure if it's a setting in Logic/GarageBand, or if there is some larger computer issues causing the buzz.

Any ideas?