What can i do when i switch my computer on and it say no signal on the screen

Hello,
hi i'm having a problem what can i do when i switch my computer on and it say no signal on the screen
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More about what switch computer signal screen
  1. check the VGA/DVI/HDMI cable. see if it is broken or not plugged in correctly.
  2. are you using dvi to vga connector??
  3. Start troubleshooting. :)

    System specs?

    Work systematically through our standard checklist and troubleshooting thread:
    http://www.tomshardware.com/forum/261145-31-read-posting-boot-problems
    I mean work through, not just read over it. We spent a lot of time on this. It should find most of the problems.
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