My new build, no input and black screen when I turn it on.

My new build, when I turn it on, there is no display. I troubleshooted alot, bought new hdmi cables, used graphic card inputs and mono inputs, if it helps any I'm using a nvidia GeForce GTX 520. Please help, oh and also I found out that my hard drive wasn't plugged in, it's 2tb hd and I have a 600w PSU. Please help.
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More about build input black screen turn
  1. Does the computer beep when you turn it on? If so, how many times?
  2. actually, it used to have a short beep 1 time, now it doesnt, and whenever i plug my hard drive in the computer turns on for 1 second then turns off, maybe PSU problem?
  3. Any help?
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