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The USB plug will need to be removed from the computer, if luck is with you the computer will work, if no part is available, use a none powered USB hub on a spare port if available to run your applications.
If the USB port is not available in the BIOS start up boot sequence then it is not possible to boot up from an USB port on this notebook model. In this case the USB port will only be activated when Windows starts up from the internal hard disk and the USB driver is running.
This happens when anything draws over 500mA, of current, if it was working OK, before, and is working now but displays that message, or not working, well in any case it seems to have gone faulty, and somehow, is now drawing more current drain, the USB port can supply. It may have been spiked too.from all the plug/unplug especially if the safely remove hardware is not used.
Both USB ports use the same driver, so if one works and one doesn't, you have a mechanically bad port. You'll need to replace the hardware to solve the problem. There are usually a lot of bad D600 motherboards on Ebay. Or try to find just the USB port you need. Fairly simple replacement task, but laptop dis-assembly will be required to reach the part.
Unfortunately, I have seen this many times. One of the major problems with the C400 model was the USB port failing. I have had many of them replaced under warranty, and I have repaired some. The USB port breaks loose from the mother board and stops working. It is possible to SOMETIMES disassemble the laptop enough to get to the port and re-solder the USB port connections. But is is a slow process for experienced people. And it does not work all of the time. i know that this is not the answer that you wanted.
You will have to take the machine apart somewhat, or at least to the point of being able to disconnect and remove the usb port. Here's a link to the D600 service manual download. It will guide you through the breakdown process.