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VGA port on Laptop not putting out signal

Posted on 2014-04-08
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Last Modified: 2016-11-23
Hi all, I have a new Dell latitude 6430. Dell external monitor was working then just stopped. When I plug in the VGA cord the external monitor wakes up and shows that it's getting a signal, but the screen is black. I've adjusted the display settings to clone the displays, just use the external, etc, but still just a black screen. I've checked and have the latest drivers, as well as swapped out the VGA cable, and tested a different external monitor with the same results. Also, uninistalled and re-installed the graphics card with fresh drivers.
Any help on this would be greatly appreciated.
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Question by:dragon24
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by:l33tf0b
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Do you have another output channel you can use?  Try DVI / Displayport / HDMI if your laptop offers that just in case the vga port is bad.  

CAn you run a diagnostics test on the laptop as well or boot with a Linux Live CD and see if it works to help troubleshoot hardware / software issue
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by:dragon24
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Thanks for the post! The only ouput channel is the VGA. I have not run a diagnostics on it yet, but will try that and post back the results.
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by:l33tf0b
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You've also tried booting it from scratch right with the monitor hooked up instead of swapping it out at the OS stage?  Sometimes signals need to be regenerated at boot up.
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by:dragon24
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Yes, have booted it with the external monitor attached with same black screen result.
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by:garycase
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I assume you've tried this, but just to be sure -- have you pressed the hot-key combination that switches between internal, external, and both for the active displays ?

... and do you have the "extend this display" option set in Display Properties ??
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by:dragon24
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Yes i have used the hot-key combination. And extend display is enabled
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by:l33tf0b
l33tf0b earned 166 total points
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Try also booting into safe mode so only basic drivers are used and see if any output on monitor.


do you have some kind of third party application such as multimon installed?  Go to start > run > appwiz.cpl and see if there's any monitor related software installed, uninstall and try.
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by:nobus
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if you reboot - nothing on the external screen as well ?
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by:dragon24
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133tf0b - No third party applications that i know of, but I will double check today. This is a brand new laptop. External screen was working on Thursday when I set up the new laptop, but when He came in on Friday and connected the external monitor, that's when it just stopped.
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by:dragon24
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That is correct nobus, after re-booting, external screen is still black. Receiving a signal, but still black.
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by:garycase
garycase earned 167 total points
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"... Receiving a signal, but still black. " ==>  This is almost always a sign that the monitor has not been extended within Windows' Display Management.   [It's also possible that it's been extended, but the desktop background is black and nothing's been dragged to the monitor.]
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by:nobus
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what happens if you boot to safe mode, or from a booatable cd, like knoppix :
http://distrowatch.com/table.php?distribution=knoppix
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by:dragon24
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garycase, yes background is black, but still can't drag anything to external monitor. Mouse does not leave desktop.

nobus, Safe mode gives me no access to even use external monitor. Same results with bootable disk (BartPE)
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nobus earned 167 total points
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try removing the bios battery for 20 sec - with the other battery and AC cord removed
then reinstall and test!
**anything on the normal screen?
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by:dragon24
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I appreciate all the feedback regarding this, but I wound up just getting a HDMI to VGA adapter and using the HDMI port on the laptop rather than the VGA port. Thanks for all the suggestions though! I split up the points among all three of you for your helpful input.
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