Plugged in external hard drive and now computer wont

i plugged an external hd into a usb port turned on the computer and the power light started blinking and screen went black, I unplugged power and re plugged and restarted but all that happens is the fan turns on, the dvd drive blinks and I get no power to the screen
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More about plugged external hard drive computer wont
  1. Try resetting your BIOS as first troubleshooting step.
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