Question about Dell Optiplex 740 Desktop Desktop Computer

Open Question

Optiplex 740 will not power up. Green power light blinks. BTW there are no diagnostic lights on the front panel on this particular model (don't know why). Manual says that it is in sleep mode, but it will not wake up. No fans or hard drives are running. PSU?

Posted by on

Ad

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get 2 Free calls (no credit card required) and instant help on almost anything you can think of (from cars to computers, appliances, handyman, and even pets).
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad
  • 1 Answer

SOURCE: Optiplex GX260 won't boot

I had the same issue and accidentally discovered a temporary solution. Unplug the power from the back of the machine, open the case and unplug the ATX power connection from the motherboard. With the ATX cable unplugged, plug the power cord back in. When you try to turn the computer back on the power light should turn orange and fans should be spinning, with it powered on plug the ATX connector back in. That should turn the computer off. Turn it back on and it should boot fine. You can even shutdown and restart, but when the power is unplugged you will have to go thru the same process to get it back up. This sounds crazy but it worked on mine. Good Luck!

Posted on Jul 31, 2009

Ad

SOURCE: optiplex 755 flashing orange power button light only

Sounds like you only have power going to your motherboard.

The power supply might be bad on it, that or maybe the power cord is going bad and is only letting a small amount go through. I don't see why there should be a problem if you have even a little bit of power going though.

Posted on Jul 11, 2009

  • 2427 Answers

SOURCE: black screen on start up

yep

unplug the system
open the case
look for a battery and take it out
take out the memory (rams)
wait ten minutes
press power button 5 times
put everything back in

and boot it

Posted on Jan 12, 2008

vagee
  • 2 Answers

SOURCE: the power light comes on as orange

REMOVE board from cabinet then check you can easily track the problem

Posted on Feb 07, 2009

ajx13
  • 110 Answers

SOURCE: Dell dimension 2400 blinking amber light

1. Remove All External Devices
2. Check the Computer's Power LED
3. If the power LED has not changed unplug the Power Cable From the Computer Disconnect All Hard Drive Power and Data Cables and power on the computer. If still no go.
4. Remove All PCI, PCI-E, and AGP Expansion Cards .
5. Remove All Memory From the Computer
6. Reseat the ATX and 12-Volt Connections . The ATX connector will be a 4 pin square connector connecting to the motherboard from the power supply and the 12-Volt Connection would be the biggest connector with a lot of colored wires.
7. If still no go.
8. Disconnect the Power Connection to the Chassis Fan
9. If the light still flashes then it could be a power supply or motherboard failure. Try a good know power supply first and if that does not fix the problem it is the motherboard. Also check the back of the tower for 4 lights lables ABCD or 1234.
Rate if useful.

Posted on Aug 11, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Del 320 optiplex orange lite blinks won't boot up



For the Optiplex 320, a flashing amber light with no sound indication can mean 3 things.


1) Your power supply has failed

2) Your motherboard failed, most likely from a bad capacitor.

3) The front panel board (where the power button is located) is faulty or not connected properly.


I've worked with 10's of 1000's of Dell Optiplex's over the past 8 years and the flashing amber light is well known as a tell-tail sign of one of those three failure. Always start your trouble shoot with a PSU tester, then inspect the motherboard for domed or split/leaking capacitors...then on to the front panel which would require another panel and ribbon from the same model.

Jan 25, 2014 | Dell Optiplex GX280 (99301) Motherboard

1 Answer

Power green light blinking


If the power light is b linking green that usually means the pc is in standby mode. Press a key on the keyboard or move the mouse to resume normal operation.

Oct 09, 2013 | Dell Optiplex 740 Desktop Desktop Computer...

1 Answer

Have a Dell Optiplex 740 desktop. Power button is lit solid orange. No diagnostic lights on. Fans still blowing. Replaced power supply unit still nothing. HELP!!!!!


before replacing main board,try replacing individual hardwares like ram,processor and if still not working,try resetting the bios by alternating the jumper on the labelled CLR CMOS

good luck

Mar 28, 2013 | Dell OptiPlex 740 PC Desktop

1 Answer

Optiplex 740 Desktop the 3 4 is green the 1 2 is no green


What are you seeing other than this? Are there other problems you see? When do you see this? I have worked on older optiplexes and the lights are yellow at different times.

Feb 15, 2013 | Dell Optiplex 740 Desktop Desktop Computer...

2 Answers

I got dell optiplex 755 desktop computer in the power supply unit at the back there is a small button and a green light what are these for??


It help diagnose problems with your computer

A solid green light means the computer is operating normally.

A solid yellow:- the power is operating fine but your computer not processing data. This could mean there is a problem with the CPU or another component on the motherboard.

A blinking yellow light: power supply is receiving power from the wall, but not functioning properly. This generally means the power supply itself is bad and should be tested or replaced.

A blinking green light means the computer is in standby mode

Jan 29, 2012 | Dell Optiplex 755 Desktop Desktop Computer...

1 Answer

When I turn on the tv all i get is the welcome screen, and it will not go any futher,there is green light flashing in front of the tv. and it will not turn off with the remote, i have to unplug it.


Hi Andre,

May I know if the LED light at the front panel has a pattern of flashes or flashing continuously in green color.

Please check if you can access the "Self diagnostic screen" by following the steps below.
- To activate, press the front panel "Activity" and "Channel down" buttons at the same time and hold for 5 secs. The Status led will then flash a two digit code. Example, if the error code is "23" the led light flashes 2 times(blink, blink) pause and then flash 3 times(blink, blink, blink). Let me know the error code to narrow down, it will help to diagnose where the fault came from.
Note : the TV must be in shutdown not switched off, or AC power cord is removed because the code will reset to "12" means no error. Use the front panel buttons not on the remote control. If you can't access the self diagnostic, press and hold the "Activity" button on the front panel for 5 secs before entering the "self diagnostic" code.
Regards,
Jdvillanueva

Nov 24, 2011 | Mitsubishi WD-60737 TV

1 Answer

Hi, Our Sony Bravia TV model number KDF E50A11E is not working. There is a red blinking light flashes three times and then goes green and then red blinking again after about 3 seconds. Is this a bulb...


On that particular model I believe there is both a lamp indicator light and then the power indicator light. If it is lamp related the lamp indicator light (LED that looks like a sun in a cup...) would be on.

If the power indicator light is flashing red to green, that is a self diagnostic code, and you will have to contact an authorized Sony repair fascility for them to translate the problem. The error codes are not listed in the user manual, since most are not user serviceable.

Mar 01, 2011 | Sony (XL-2400) Projector Lamp for...

1 Answer

2 light is lit on front of cpu


That's not a problem. One light(Green one) is for power and another (Red one) is for Hard Disk. Red one will blink continuously, if hard disk is being accessed.

May 20, 2010 | Dell Optiplex 740 Desktop Desktop Computer...

2 Answers

Problem power supply dell optiplex 740 blinking orange light only


hi,
this is probably a no power/nopost problem here is a helpfull link
http://tinyurl.com/d4t55m

further queries are welcome
if you think my solution was helpfull please do rate me

Mar 28, 2009 | Dell Optiplex 740 Desktop Desktop Computer...

Not finding what you are looking for?
Dell Optiplex 740 Desktop Desktop Computer  Logo

Related Topics:

3,782 people viewed this question

Ask a Question

Usually answered in minutes!

Top Dell Computers & Internet Experts

Les Dickinson
Les Dickinson

Level 3 Expert

18402 Answers

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers

mukhtar21 shaikh
mukhtar21 shaikh

Level 3 Expert

2017 Answers

Are you a Dell Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...