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How do I fix problems of Dell computer 780 with power light yellow and black screen?

I restarted it so much times and I tried to reboot on safe mood.But no change

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3 Answers

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  • Dell Master
  • 884 Answers

Hi
You don't mention which model of 780 you have and there are 4 different sizes. However several manuals (in pdf format so can be downloaded and saved to computer) can be found here:
Product Support Dell UK
Looking through them, using "light" as a search term I found these quotes below.
"Solid amber light when the computer does not
start indicates a problem with the system board or
power supply. Blinking amber light indicates a problem
with the system board."
and
"solid amber - indicates that the system
board is unable to initialize"
From these I would think that the main board (motherboard) on your computer has become faulty, and needs replacement.
Hope this is helpful, if so would you please register that with Fixya
Cheers

Posted on Nov 20, 2014

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  • Expert
  • 320 Answers

Yellow or Amber lights on the power button of dell computers generally mean power issues. This can be a bad power supply, or dead motherboard.
If the computer is under warranty you can contact dell for a free replacement of the part. Otherwise you may need to contact a local computer repair shop to test which part is defective and have it replaced.
In most cases the data on the hard drive is fine, so you probably have not lost any data due to this issue.

Posted on Nov 20, 2014

  • Official Brand Answer
  • 560 Answers

Getnet,
What do the diagnostic led lights show. The diagnostic LEDs are located on the front of the chassis next to the power button. These diagnostic LEDs are only active and visible during the POST process. Once the operating system starts to load, they turn off and are no longer visible. Below is the manual that provides information on what the led pattern shows to help resolve the issue.
Optiplex 780 manual
http://dell.to/1HqoNmD
Thank You,
Dell-Jesse L
Dell Social Media and Communities

Posted on Nov 20, 2014

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Hi,
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Posted on Jan 02, 2017

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SOURCE: stuck in safe mode with black screen

spywaregard 2008 is malware, a parasite if you will

http://www.pcthreat.com/parasitebyid-7159en.html

the last 1/2 of this article will run down a list of files you need to delte to get rid of this nasty little bugger. You can also download various tools to remove it, but it is dependent on your comfort level. if you are comfortable searching for files and changing a couple of registry keys, then by all means, manually is the way to go. If not, you will not have a hard time finding a tool to get rid of this

Posted on Jan 09, 2009

  • 1 Answer

SOURCE: Loud Fan, Three Beeps, Black Monitor and No Keyboard response

I have the same model after youlet it sit for a long enough period to cool down it will come back on and work normal, it is a cooling problem called gateway and they confirmed this theproblem I ran in to was what fan this computer has 3. temp fix I used was to remove the tower cover to allow better air flow try this till you can figure out what fan is messing up

Posted on Jan 10, 2009

Fixe_You
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SOURCE: Computer monitor stuck in safe mode

the problem is with ur Computer's Graphic card.

u can put a new one in case if it is a built in graphic card Chipset.

check ur manufacturer support page for more details.

plz rate this post as good as u can

Posted on Feb 06, 2009

  • 28 Answers

SOURCE: I have a Dell Dimension 4600 and it won't boot up.

i would have to disagree with jerry, while that seems reasonable if the motherboard fan isn't running at all then whether or not the video card is ok is somewhat irrelevant.
I would agree somewhat though, i think the PSU might be a good thing to check to see if it is functional.
when you power it on does the CPU fan start or shudder at least ? that would be my first guess for a problem if you had been having any problems recently

Posted on Apr 17, 2009

  • 4 Answers

SOURCE: My dell xps wont start properly, yellow blinking light

I have an HP that does close to the same thing. Mine goes into a 'Perm-Sleep' mode that I can't seem to pull it out of. I have to remove the battery, then unplug the power adapter, not in that order. Leaving it in this condition for about a minute so that all the power stored in the RAM goes away. This is the same as holding the power button down for 10 to 15 seconds until it completly turns off, sometimes referred to as a 'Cold Boot.'

Once I have powered it down I have to go into the control panel and select the power settings and make sure that hibernate is not an option. If you close the lid on the laptop and the systems goes into a sleep state, it may be configured to go to hibernate after, say an hour or when the battery gets close to being drained. My computer does not like to come out of hibernate and I have to Cold Boot it, so I just don't let it go into a hibernation in the first place anymore.

Posted on May 10, 2009

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