Question about Dell Optiplex 755 Desktop Desktop Computer
Machine was on for about 5 minutes, shut off and now the yellow flashing light.
Posted by Anonymous on
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.
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Posted on Jan 02, 2017
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. Do you remember what the BSOD said?
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.
Do you remember what the BSOD said?
Posted on Oct 23, 2007
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
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.
Posted on Mar 27, 2008
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
SOURCE: I powered off my Dell
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.
Posted on Sep 15, 2010
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