Problem with Booting a Dell Optiplex 780 Desktop



  • Hi everybody

    i have a weird problem with one computer DELL optiplex 780, as soon as i plug the power cable, the computer start automatically, the fan is turning but approximately after 2 min , the computer shutdown completely, knowing that during that 2 min no display on the monitor,
    if i power on the computer the same thing happen again, no display and after 2 min shutdown

    is there any hardware hero here to help ??

    thanks


  • Service Provider

    I assume that there are no beeps at all? It sounds, to me, like the motherboard has failed. If the motherboard was getting power and acting correctly it would not likely power itself on automatically and it would normally be able to report a beep code for the error condition.



  • The last several Dell Desktops I've ordered would do this. Not for the duration you specify though.

    First order of business - Open it,.. Pull everything out (not the CPU) and put it all back. If this was newly shipped, it is possible that the Memory and etc could just need to be re-seated.

    If this does not resolve it,.. it's likely either something more serious.. Maybe either with the CPU or the MOBO itself.


  • Service Provider

    @gjacobse said:

    The last several Dell Desktops I've ordered would do this. Not for the duration you specify though.

    First order of business - Open it,.. Pull everything out (not the CPU) and put it all back. If this was newly shipped, it is possible that the Memory and etc could just need to be re-seated.

    If this does not resolve it,.. it's likely either something more serious.. Maybe either with the CPU or the MOBO itself.

    I was about to argue against doing this because that is what the warranty is for, then I remembered where @IT-ADMIN is.

    Do what @gjacobse said and report back.



  • @gjacobse said:

    The last several Dell Desktops I've ordered would do this. Not for the duration you specify though.

    First order of business - Open it,.. Pull everything out (not the CPU) and put it all back. If this was newly shipped, it is possible that the Memory and etc could just need to be re-seated.

    If this does not resolve it,.. it's likely either something more serious.. Maybe either with the CPU or the MOBO itself.

    i tried to pull out everything excluding CPU but the same thing happen,
    Note : there is no beeps,
    this computer has 5 years old



  • @IT-ADMIN said:

    DELL optiplex 780

    Okay - What about indicator lights? The 780 should have status lights of 1-4. Are there any ones blinking?

    Likely that your PSU has crashed.. there is enough voltage to cycle the fans but little else.



  • @gjacobse said:

    @IT-ADMIN said:

    DELL optiplex 780

    Okay - What about indicator lights? The 780 should have status lights of 1-4. Are there any ones blinking?

    Likely that your PSU has crashed.. there is enough voltage to cycle the fans but little else.

    the light is OK, it remain on (green light) during that 2 min
    sorry .what do you mean by PSU??


  • Service Provider

    PSU = Power Supply Unit



  • @IT-ADMIN
    Yes - as SAM mentioned PSU Power Supply.

    The power button does have a green LED - but the numbers 1-4 should be amber. , and they actually maybe on the back of the unit. They are a POST - Power on Self Test - code...



  • Various solutions to remove booting errors:

    • Verify the Computer Finishes Initial Power-Up (POST)

    • Unplug All External Devices

    • Check for Specific Error Messages

    • Reset the BIOS to Default Values

    • Run a Computer Diagnostic

    • Check Dell Optiplex 780 Manual for more solutions.



  • @IT-ADMIN

    Can you try swapping the RAM DIMMs, or removing one.

    Also try:

    Disconnect it from the wall outlet, press the power button for 30 seconds for 2-3 times, connect it to power and power it on again.



  • @gjacobse In the past I have had issues with the 780 and 7010 series where the power button board causes this issue. Replacing the PSU did not work so found out the issue on the power button just in case the PSU does not work for you.



  • Funny how a necro-post (almost seems like a bot-post) by @cucezo has brought new life to this thread.



  • @Danp said in Problem with Booting a Dell Optiplex 780 Desktop:

    Funny how a necro-post (almost seems like a bot-post) by @cucezo has brought new life to this thread.

    Funny how both posts by that account are totally bot-like...

    edit: both their posts have links to "guideusermanual.com". not suspicious at all.



  • @RojoLoco Grape minds....



  • As mentioned, check the power button itself. Still have 780's here many times the button sticks and will cause this symptom.



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