Question about Dell Optiplex 755 Desktop Desktop Computer

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Why does my desktop DELL Optiplex 1700L just flash YELLOW and refuse to come on, motherboard light is on

Machine was on for about 5 minutes, shut off and now the yellow flashing light.

Posted by Anonymous on

1 Answer

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  • Dell Master
  • 998 Answers

An Amber (Yellow) blinking power button indicates a low voltage problem. This can be caused by a defective power supply or a defective motherboard. Just to make sure that nothing else is causing the problem, remove any PCI cards like modem, video card, sound card, etc... Remove the memory modules and disconnect cables to CD/DVD drives. Look at the USB ports to see if any are damaged.

Posted on May 18, 2014

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

tom19511
  • 1601 Answers

SOURCE: powerbutton flashing yellow

If the main power button LED is flashing or solid yellow, this could indicate a hardware problem.

 

Was it running good before?

 

Are the diagnostic LED lights all green?

 

Here is what dell says:

 

If the power light is blinking amber  —

 The computer is receiving electrical power, but an internal power problem might exist.

  • Ensure that the voltage selection switch is set to match the AC power at your location (if applicable).
  • Ensure that the processor power cable is securely connected to the system board.

Do you remember what the BSOD said?

Posted on Oct 23, 2007

IB4G2008
  • 3587 Answers

SOURCE: pover up trouble

sounds like something is drawing down on your 12 volt supply drives or on board regulators. Try it without the drives connectged, and see if you can get the system to boot up(you'll just get a notice that your drives are unavailable, but you'll already know that, right?

got backup for your Dell?

Posted on Feb 15, 2008

MDoe
  • 156 Answers

SOURCE: Dell Optiplex GX260 Tower flashing yellow power button

Hi

Power up the Optiplex GX260 and check the QUAD Pack Diagnostics LEDs (located at the back). Compare the LED pattern to http://support.dell.com/support/edocs/systems/opgx260/en/ug/solvprob.htm#1167139 for more info.

Ideally, to troubleshoot and resolve the issues, try removing all PCI devices, disconnect all external devices/peripherals including keyboard and mouse. You may leave the Monitor connected. Power up the PC and check for successful Power On Self Test (POST). If POST completes (generally fails on "Keyboard not present"), shutdown, connect keyboard and try POST again.

If all goes well, install PCI devices one at a time and test successful POST. This will help identity a failing device.
If issue persists, after removing all devices, remove the CMOS battery for about 90 seconds and try POST again. If same, remove all DIMMs (Memory) and check for beep codes. Compare beep pattern to http://support.dell.com/support/edocs/systems/opgx260/en/ug/solvprob.htm#1176760.
NB: Ensure to remove power lead and press power button briefly to use up flea power before working in the system.

If the system beeps, it suggests that the CPU and systemboard are "likely" fine. Install one DIMM at a time and test successful POST. If there no beeps then the systemboard and/or CU is/are at fault.

Regards
Mike

Posted on Mar 27, 2008

  • 1 Answer

SOURCE: start button flashes yellow - will not turn on

I have found that if the CMOS battery is removed and the unit unpluged for 5 mins (reseting the unit to default config) It will restart. The battery should not be replaced thus to maintain your date and time settings, it shoud not be unpluged for long periods.

Posted on May 20, 2009

  • 1684 Answers

SOURCE: I powered off my Dell

Hello,

This model has been having problems with the motherboard that can cause that exact problem, Not powering up, Flashing yellow light or locking up right after booting up. The first thing to check is parts called capacitors on the motherboard. We have an article posted on our web site at: http://www.ccl-la.com/blog/index.php/dell-optiplex-745-repair/ that has detailed pictures and information about this issue. The pictures are of the tower case Optilpex 745 but the board is the same for your unit. Check it out and see if your board has this issue. If you can solder then you should be able to fix it yourself for less than $15.00 If your board does not have the bad capacitors then the blinking yellow light is a failure in the power supply unit.

I hope this helps, if so please rate our solution.

CCL_Tech
Corporate Computer
www.ccl-la.com

Posted on Sep 15, 2010

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Hello,

This model has been having problems with the motherboard that can cause that exact problem, Not powering up, Flashing yellow light or locking up right after booting up. The first thing to check is parts called capacitors on the motherboard. We have an article posted on our web site at: http://www.ccl-la.com/blog/index.php/dell-optiplex-745-repair/ that has detailed pictures and information about this issue. The pictures are of the tower case Optilpex 745 but the board is the same for your unit. Check it out and see if your board has this issue. If you can solder then you should be able to fix it yourself for less than $15.00 If your board does not have the bad capacitors then the blinking yellow light is a failure in the power supply unit.

I hope this helps, if so please rate our solution.

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www.ccl-la.com

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