I can't find my USB external hard drive.

I have macbook pro with OSX 10.6.8 . I have been using a Seagate Free Agent GoFlex Desk 2TB usb Hard Drive as my Time machine backup drive. I had it connected to my airport base station and it was working. I had to move the Base Station to a different location and now the hard drive can't be found. I have even tried doing a direct connection to the Notebook USB drive. The light go on on the front of the drive but I can not find it in finder or time machine. Any suggestions will be helpful. Thanks.

I have a somewhat similar problem. I've been running my MacBook off an external USB drive. I haven't used it in a while but now I get the flashing question mark as well. Safe mode tells me to restart the laptop. PRAM (sic) reset doesn't work. The drive mounts without a problem on my Mac Pro.

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