Solved Motherboard only turning on without the four pin cpu power

February 12, 2014 at 15:36:24
Specs: Windows 7 64 bit
Gigabyte ga-m68mt-s2p motherboard
Amd phenom x4 955 cpu
Xfx amd r9 270
8gb ram
Evo labs 500 watt psu

Ok so I added another fan to my system and booted the machine up this was fine for a moment and then the system just died as windows was loading.
I thought that I may have overloaded the psu so I stripped the computer down to the bar essentials one dim of ram the cpu and an old Radeon 6670 that was used in the system about 3 weeks ago and had nothing then I tried the on board graphics card still nothing tried numerous psu's ranging from 300 - 500 watt and still the motherboard would not post with no sound from the motherboard
I tried the motherbord without the 4 pin cable and to my supplies the motherboard showed signs of life however did not post due to cpu not being powered up.

Is this a faulty power supply motherboard, cpu.....?

message edited by Eckoonian


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#1
February 12, 2014 at 16:17:11
Why did you feel you needed another fan? One exhaust fan in the rear is generally all that's needed. Front intake fans are optional, side panel fans should not be used. What did you connect this new fan to - the motherboard or the PSU? You didn't provide any info about the "300 - 500 watt" PSUs you tried. And I couldn't find anything about the "Eco labs 500 watt psu" when doing a google search.

EDIT: I also couldn't find anything about the "Gigabyte ga-m68mt-spot" either, do you mean GA-M68MT-S2P? If so, it has onboard graphics so try using that instead of a graphics card. You may also want to try resetting the BIOS.

http://www.gigabyte.us/products/pro...

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#2
February 12, 2014 at 16:44:57
Sorry I ment to say Eco labs and yes it is the GA-M68MT-S2P and there was a dell psu at 300 watt an alpine psu at 450 and another dell psu at 500 watt the fan was added to the motherboard on a splitter connecting two fans to one connector these were the fans inside my case and the additional fan was added in order to keep my case cooler,I have tried on board graphics but still have got nothing and have also reset the bios by putting a jumper on reset CMOS and removing the CMOS battery.

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#3
February 12, 2014 at 20:38:09
✔ Best Answer
Did you check your temps to see if you needed more cooling?
Which fan connector did you use? CPU fan or case/system fan?
Are the fans similar enough to run together?
Did you remove the splitter?
Fan position and orientation is more important than the total number of fans. Name the position and orientation of the fans to determine if it was well thought out or detrimental from the beginning.

Check all connectors and cards to make sure that everything is seated properly. Look for pinched wires and loose screws that my have fallen into corners or under the motherboard.
When you cleared the CMOS with the jumper, did you unplug the power? You do not need to remove the CMOS battery when you are already using the CMOS jumper, it removes the battery from the circuit and shorts out any residual power the circuits may be carrying.
Are these other power supplies known working power supplies or were they just sitting around? If none of them are known to be working, then you have not accomplished anything by trying them.
If you did not disconnect the power before trying the second fan/splitter, you did not make sure that you were not carrying a static potential, or the fan splitter/ 'Y' connector was poorly made, then you may have damaged something.

You have to be a little bit crazy to keep you from going insane.


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#4
February 19, 2014 at 16:58:23
Motherboard was faulty as a chip had blown

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#5
February 20, 2014 at 18:48:33
Thank you for letting us know.

You have to be a little bit crazy to keep you from going insane.


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