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I have confirmed that both the cable and monitor are working perfectly. I get No signal and No Display when connecting my Laptop to an external display.

The cable is VGA and the person using the computer before me said it was working fine.

product: HP Pavilion g7 Notebook PC (QE124UA#ABA)
vendor: Hewlett-Packard
version: 0691120000204610000620100
width: 64 bits
capabilities: smbios-2.7 dmi-2.7 vsyscall32
configuration: boot=normal chassis=notebook family=103C_5335KV G=N L=CON B=HP S=PAV X=Null sku=QE124UA#ABA uuid=35434431-3339-3158-3959-441EA1E2865E

Hardware specifications

P.S. I've tried different working cables and monitors. So it's not a monitor issue.

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  • How have you confirmed that the cable and monitor are working? Is the cable VGA or DVI or HDMI? Did it ever work before and if yes what has changed?
    – harrymc
    Nov 13, 2013 at 18:37
  • sorry not to mention that. I've tried on different working cables and monitors.
    – Alex
    Nov 14, 2013 at 6:10
  • Better also answer my other questions.
    – harrymc
    Nov 14, 2013 at 18:14
  • @harrymc sorry. it's a company PC so I'm told by guy who used it before that it used run on Windows and was working. He said it even worked for him after installing the Ubuntu. Now the monitor is not getting any signal.
    – Alex
    Nov 15, 2013 at 6:05
  • Is the cable VGA or DVI or HDMI?
    – harrymc
    Nov 15, 2013 at 6:25

3 Answers 3

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It's not uncommon for things to stop working in Ubuntu (touch pads, monitors, wireless cards) after a kernel update. This seems likely since it apparently worked for the previous owner.

Roll back your Linux kernel to the previous version through the Grub menu and try again.

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Have you enables the external display in Ubuntu? usually laptops have a display switching button. Why don't you try that?

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Sometimes the BIOS needs configuring, for example "LCD and analog RGB" instead of "autodetect".

On some laptops a monitor is only detected if it's present at power-on.

Some laptops have a keyboard shortcut such as Fn+F4 or Fn+F7.

Your can also try entering :

xrandr --output VGA1 --auto
xrandr --output VGA1 --off
xrandr --output VGA1 --auto

Also ensure that you have the latest driver for your video card.

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