No signal from desktop

hello everyone, my acer am3400-u2505 shows no signal to the monitor. any suggestions?

Hello, You wrote: "Yes I changed monitors and I used parallel port instead of HDMI".The parallel port is used by the old printers or doggle software. I think you mean VGA port. Sorry to ask you this question again:When you connect another monitor, the display is it correct? One beep means:System is ready - System is OK.

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    If the above steps did not resolve your issue please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region. http://www8.hp.com/us/en/contact-hp/ww-phone-assis​t.html
    I would like to thank you for posting on the HP Forums. Have a great day!
    Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
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    Dunidar
    I work on behalf of HP
    Find out a bit more about me by checking out my profile!
    "Customers don’t expect you to be perfect. They do expect you to fix things when they go wrong." ~ Donald Porter

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    Untitled.png ‏212 KB
    Untitled.png ‏212 KB

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