Thank you for being a valued part of the CNET community. As of December 1, 2020, the forums are in read-only format. In early 2021, CNET Forums will no longer be available. We are grateful for the participation and advice you have provided to one another over the years.

Thanks,

CNET Support

Resolved Question

My pc is not starting. There is something wrong with 4pin au

by May 10, 2014 7:40PM PDT

few days ago I saw a spark from my power supply and my pc didn't start after that so today I replaced my power supply with new one and its still not working whenever I hit the power button the power light blinks for a second then nothing.... After just removing the 4pin auxilliary connector from the motherboard and switched the power on, it worked, the power light was on and my Cpu fan started but I switched power off after 5sec because I was not sure about function of auxilliary connector. Then I again did with connecting the auxilliary connector and it didn't work just the blinking. . Is auxilliary connector necessary, if yes then what can I do to fix this problem
My motherboard is gigabyte GA-M68MT-S2 it have a 24 pin atx and i also have a nvidea gt520 1gb. Cpu=amd athelon x2 260 (3.2GHz)

Discussion is locked

Abhigawande8 has chosen the best answer to their question. View answer
6 Posts
- Collapse + Expand Details

Best Answer

- Collapse -
Unplug everything
by May 11, 2014 12:11PM PDT

...from the USB ports, from the LAN port, from everything except for video cord and keyboard. Plug the 4 pin auxiliary in. You do have 24 pins into the ATX power plug? Or just 20 pins into it? You aren't accidentally using the extra 4 pin plug that is supposed to be with the 20 pin plug for the back are you? If it boots OK, or makes it to POST at least, then you know your "short" is something you are plugging into the motherboard and not on the motherboard. If you still have a problem, turn it off, unplug the keyboard and then let it boot again. If it's a USB keyboard you can plug it in later anyway. If it won't boot after that you will need to open the case and unplug drives and see if you can get POST. If all that fails, motherboard or CPU, or RAM or several of them are burnt.

- Collapse -
I ve done it already
by Abhigawande8 May 12, 2014 4:06AM PDT

Thanx james
I've already tried all these and still my pc is not booting I think the motherboard fried. And 1 have a 24 pin atx and i am using 12v au in its slot

- Collapse -
Answer
Saw a spark...
by May 10, 2014 10:10PM PDT

Is no simple thing as that suggests a surge was possible and whatever weak link you have, it found it. Provided you a better or at least same wattage of a decent PSU, then your PC should have booted. Since, it didn't offers that something amiss happened. You offer that the au connection when disconnected starts the PC. Now, let it finish the full booting and see what happens. If you don't need the au actually it will boot w/o a problem or become known. With it connected, then you have your answer the mtrbd. got hosed -OR- you find what the au powers, which is probable video side. If video is present then the possible other video leads if connected are providing that. Then the au connection can remain disconnected, otherwise, no video display will pretty much be your answer once it truly and fully booted and requires all power to work. You can disconnect devices and see if that helps, but I suggest another video card or port to check this out. IMHO, I wouldn't trust this w/o testing and that maybe an iffy situation, because if some device is also hosed, it may take down a working test bed.

tada -----Willy Happy

- Collapse -
Nothing showing on screen
by Abhigawande8 May 11, 2014 1:29AM PDT

Thanks willy
I tried to start the computer without au the system didn't boot actually there was nothing showing on screen though my power light was on and Cpu fan was running. I have two vga slots one on mother board and other on graphic card I connected vga cable to both the slots and it didn't work

- Collapse -
Answer
I guess it was short circuit
by May 10, 2014 10:44PM PDT

There is no earthing in my switch board so I guess it was a short circuit or something like that

- Collapse -
Only makes it worse...
by Willy May 10, 2014 11:01PM PDT

Having no "ground" or proper one, then it sought the best way to do that. The point being anything could in the path of finding ground is susceptible to damage. A PC has low voltage aspects to run and it doesn't take much to throw a wrench in the works. Reduce the PC to bare minimums and see how it goes or follow my earlier and see what happens as you explained it. Of course get better surge and power protection. Maybe fix at least that household line where the PC is at to reduce re-occurrence.

tada -----Willy Happy

Back to PC Hardware forum

CNET Forums

Operating Systems
Software
Electronics & Gadgets
Hardware
Tablets & Mobile Devices
General Help
Brand Forums
Roadshow Autos
Off Topic

Other Forums

Forum Info