20 Most Recent Dell OptiPlex 780 PC Desktop Questions & Answers

There should be 4 DIMM slots - two with white tabs and two with black tabs. DIMM 1 should be the white tabbed slot closest to the processor. Slots 1 and 3 (both white tabbed slots) should have RAM installed first, then slots 3 and 4 for additional RAM. If Slot 1 already has RAM in it, pull it out and push it back in to reseat it. If that doesn't work, replace the RAM in Slot 1.

Dell OptiPlex... | Answered on Sep 15, 2017

You may want to replace the fan. You can call the Dell Spare Parts Department at 1-877-717-3355 to purchase a fan.
Thank You,
Dell-Jesse L
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Dell OptiPlex... | Answered on Jun 04, 2015

William John,
Click the link below for information on creating a gmail shortcut to your desktop.
Thank You,
Dell-Jesse L
Dell Social Media and Communities

Dell OptiPlex... | Answered on Apr 23, 2015

Beeping usually means you have a memory problem. Try removing one memory stick at a time and power on to see which is defective.

Dell OptiPlex... | Answered on Jan 03, 2015

Does the system manage to boot at any point? If it does and there is a period before it restarts the system could be overheating. I would ensure all cooling fans and heatsinks are clear of dust/debris.

If you are unable to boot to Windows, try starting in safe-mode. If you can start in safe-mode it will be a strong indication there is problem with your software. At this stage in safe-mode I would first of all try a system restore back to when my computer last worked, if you have no success I would then suggest a virus check/clean in safe-mode.

If you find the system won't even start in safe-mode I would check your RAM is seated correctly, and if that doesn't solve your issue proceed to check/test all other components of the computer. Being a DELL if you press F12 during start up I believe you can ask the system to do a hardware diagnostic test.

Dell OptiPlex... | Answered on Mar 20, 2014

Looks like Memory Issue,
Memory modules are detected, but a memory power failure has occurred.
You can try as follows :
  • If two or more memory modules are installed, remove the modules, then reinstall one module and restart the computer. If the computer starts normally, continue to install additional memory modules (one at a time) until you have identified a faulty module or reinstalled all modules without error. If only one memory module is installed, try moving it to a different DIMM connector and restart the computer.
  • If available, install verified working memory of the same type into your computer.
Let me know

Dell OptiPlex... | Answered on Feb 26, 2014

Drivers for OptiPlex GX270 this site has all the drivers you need :)

Dell OptiPlex... | Answered on Feb 01, 2014

2bg ddr3 1066GHz is supported

Dell OptiPlex... | Answered on Dec 09, 2013

Go to Dell Support > Optiplex 780 Desktop PC > Manuals & Documentation > Dell Optiplex 780 Service Manual,


Diagnostics > Diagnostic Lights,

"Problem Description - A possible expansion card failure has occurred"

"Suggested Resolution -
1) Determine if a conflict exists by removing an expansion card (Not a graphics card) and restarting the computer.

2) If the problem persists, reinstall the card you removed, then remove a different card and restart the computer"

Be SURE to follow Anti-Static Procedures.


Dell OptiPlex... | Answered on May 13, 2013

Here is a link to your computer's service manual that has a chapter on diagnostics including Beep codes:
This for the desktop model. If you have a different model you can choose from this link:

Dell OptiPlex... | Answered on Feb 22, 2013

Most surge protection power boards will protect computer equipment from mains spikes and surges.
A better and more expensive solution is to use an uninterruptible power supply (UPS). These units provide surge and spike protection and also provide power in the event of mains power failure.
Make sure you select an UPS model that meet the power requirements of all your computer equipment that is connected to the UPS with a mains down time of say 1/2 hour to give you time to shut down your computer in an orderly manner.

Dell OptiPlex... | Answered on Sep 10, 2012

Restart your computer
During the boot process you will see on the screen to press a certain key to enter setup usually the Delete or F2 key
this will vary depending on your computer and operating system

Press and hold that key during the boot up process to enter BIOS using the arrow keys load failsafe defaults or load optimized defaults press escape then press f10 to save to cmos to restart

hope this helps

Dell OptiPlex... | Answered on Aug 01, 2012

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