Okay, I figured it out. At least this fix worked for me.
Boot into your BIOS and go to "Integrated Peripherals", disable "USB Storage Function" and you should be able to boot as before. It's a "Legacy" setting which means it was designed for older operating systems prior to Windows XP. Leave the "USB Mouse" and "USB Keyboard" functions enabled if either of those are connect via a USB cable. That way you can navigate the BIOS with no difficulty.
I had forgotten I had enabled this sometime back, why I did I don't know. The system used to boot up okay and then it didn't and now it does again with a USB external hard drive plugged-in and powered on.
Try it and see how it works for you.
Last edited by Nibiru2012; 11-28-2010 at 03:03 PM..
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