Black screen flashing line top left

Ive just rebuilt my computer into a new case and has worked flawlessly for 2 days now no problems, when I came to power on this afternoon I got a black screen with a flashing cursor. I noticed I had my external hard drive plugged in so I removed it and powered up the computer again. Its all working fine now but any idea to what happened? and did my external hard drive cause this?

Should I be worried?
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More about black screen flashing line left
  1. No, you don't have to worry. The system tried booting from the external HDD and didn't find an operating system (like Windows).
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