I think i found my own answer, i'll do one of the following when i get home. Anyone else ever experience this:
OS X
Try a different cable.
Repair the Permissions. Open the Disk Utilities and click on the First Aid Tab. Highlight your 'boot volume' on the left side of the window and click on 'Repair Permissions'. (Don't bother verifying first. It takes as long as repair and something always needs repairing).
Shut down, power off and disconnect all devices. Unplug the computers power cable (or remove the battery if a laptop). Wait about 15 minutes. Plug everything back in and boot up. This may reset the bus.