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Comp does not turn on. green light off but goes on when mobo disconnected

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Test the power supply in another computer.
If that works, the next thing is to check the mother board. Remove all daughter boards from the slots. Remove all memory, disconnect all hard drives, cdroms, etc.
Make sure there is nothing plugged into the mother board except the video cable (if it is on-board video), if not, then make sure you have a good video card plugged in.
Again with no memory, no boards except a video card, if needed, and the power plugged into the board.
Turn on the power, and watch the screen. If it works, then you should get a notice that there is no memory, no hard drive, and so on.
If that is the case, then proceed to install one item at a time to isolate the problem. If it is not the case, the the mother board is probably bad. One other thing to check would be the CPU.
If you get no notice with the above, then the cpu could be bad. Check it in another computer, if possible. This should tell you what the problems are or is.
In the above cases, either the cpu or the mother board can be isolated to see what is bad, if any.

Posted on Oct 07, 2009

Testimonial: "Great....I'll try that tonight. I font have another computer to test it on but I can ckeck voltages. So if the CPU is bad that's it fur the comp right"

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Not sure if the PS is really at fault. Green light in back says power coming in but unit will not turn on. Local PC repairment refuse to fix saying it could also be mobo problem.


When one goes, usually both goes sadly :p

If the unit isn't turning on you should replace the motherboard. But beware, if it is the power source at fault as well it will just break the next motherboard that you put inside of it since it will just zap it with an overcharged / bad current.

I hope this helps, I'm sorry about that buddy.

Feb 26, 2013 | Computers & Internet

1 Answer

D946g275


Did you just build this comp? If so prob got led to mobo connections messed up a tad , If not prob reset bios by jumpin the pin next to battery unplugged

Dec 27, 2011 | Intel Motherboard

1 Answer

Green light flashing on compaq presario - computer will not turn on


You may have a 12V ATX line (6 wires) that needs to be connected to the mobo in addition to the main power (about 20 wires). Make sure they are both connected - try again.
Remove 1 stick of memory - try again.
Swap the stick you removed with the other stick and try again.
Unplug the power switch wires from the header on the mobo - try again - make sure you write down where each wire goes. Try again.
Swap the power supply with another ATX to see if it is the power supply (PS fail more than mobos due to dust buildup).

Any doubts you can get the help of a technician through

www.thebestpcdoctor.com

Toll free: 877 407 9229

Aug 30, 2011 | Compaq Presario 5000 PC Desktop

1 Answer

I bought a brand new M4A785-M, I have all compatable parts, even swapped every piece out onto my comp with the same board and boots fine. The comp booted fine before, I swapped the single core Sempron (1.8...


Is your phenom Phenom-X3-8450e or AMD-Phenom-X3-8450 ?
8450e is suported by that mobo but in the asus suport page you wont find 8450.
Check here https://www.asus.com/Motherboards/M4A785M/HelpDesk_CPU/
8450e runs on 65w and 8450 runs on 95w.
Does your mobo run with your old CPU?

Apr 09, 2017 | ASUS M4A785M Motherboard

1 Answer

Emachine D2880 no power clarification


your getting power to your PSU, via the green light on your mobo.
verify the PSU has a green light(most emachines do)
it sort of sounds stupid but, check the connection of the cable coming from the front of the case(the wires that connect to the mobo to the power button on the outside of the case.

if all else fails, take the pc out of the case.. put all components on a static free bag and start to rebuild your PC(without a case)
...this will rule out a short on the PC case, and faulty wiring from the case...

pretty much sounds like you've been through almost every step except replacing the PSU(you just said you tested/but your getting power to the PSU)

hope some of this helped

Sep 04, 2009 | E-Machines eMachines Desktop PC

2 Answers

No power to dell latitude d600


have you checked your ram? remove it and see if it powers on and qickly turn off. if it powers on replace ram after shutdown. if problem not fixed coud be cpu problem or mobo.

Jun 02, 2009 | Dell Latitude D600 Notebook

1 Answer

Hp pc m7640n won't turn on and power supply light is out


OK, this can be a hard thing to fix. Most of the time, the power supply is the first thing to go on a PC. However, when you stated that the motherboards LED came on after you unpluged the PS from the motherboard, it leads me to believe that the motherboard is the issue but the power supply might be outputting higher voltages and the motherboard might be shutting down. Since the power supply is cheaper then most motherboards, I would recommend getting a new one. Check ebay for a new power supply. It should be about $20 with shipping. If the same thing happens, then you need a new motherboard...

May 30, 2009 | HP Pavilion m7640n PC Desktop

1 Answer

I have a media center cpm 1180n desktop, the green light on back of PS is blinking and when I disconnect the mobo is steady green however when I connect the mobo back to my MB and press the start bottom...


yes it sounds like the power supply is shot, you can get a replacement at any computer shop for around $40. i would put in a 400w or 450w that way if you add another hard drive or opitcal drive it wont be a strain on the new power supply

Nov 30, 2008 | Computers & Internet

1 Answer

Blank screen


was it working before
check all your cables and lines make sure a pet didnt get behind there also if you have kids make sure they didnt put liquid into your comp

cause if it was sounds like you got hit by a virus that effects all major compartments of comp

green to yellow is standby mode

May 30, 2008 | HP Pavilion 8860 (P2941A) PC Desktop

4 Answers

Dell dimension 5100 won't power on


might be a problem with the power button...try exchanging the power adapter and the reset adapter in your motherboard...this would become:

RESET BUTTON: as power button.

view your manual on where to find this adapters in your board.

Nov 19, 2007 | Dell Dimension 5100 (D51L1) PC Desktop

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