Solved epu 4 pin connect shunting MB?

October 28, 2013 at 17:34:47
Specs: Windows XP, i5
I assembled a board ( mainly used old parts ) and could not get a post. I finally discovered I didn't have the 4 pin CPU connect connected. Affecting doing so the PSU is shunting ( nothing gets power ). The only part I dont know woks is the CPU. I have not see this before and wanted to get some input. I have no way to test the CPU, only option is a return to ebay user. Currently I have a cpu, memory, and video-onboad connected. If I remove the 4 pin connect I get power no post no beep codes. Connecting it I get a shunted PSU no power.

Thoughts?

info.
This is an am3 socket with a amd Athlon 2 chip.
I have a asus m4a78f7d-m evo board.
DDR 3 ram ( compatible by the manual )
PSU 500 watt corsair way more then needed.

Let me know if I missed any info that may help.



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#1
October 28, 2013 at 18:09:44
✔ Best Answer
Your board model number appears to be incorrect. Asus lists 28 M4A78 boards & 30 EVO boards but none of them match the number you supplied.

https://www.asus.com/Search/?Search...

https://www.asus.com/Search/?Search...

Did you already put the board in a case or are you bench testing? If it's in the case, I suggest you take it out & start from scratch. What type of CPU cooler are you using, stock or aftermarket? What about thermal paste? You must use it & it must be applied properly. For AMD CPUs, the middle dot method is recommended. Did you confirm your CPU is on the supported list?

If you don't know how to properly bench test, see the following: http://www.techsupportforum.com/for...


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#2
October 28, 2013 at 19:30:17
Looks like I did in fact butcher that
m4a785td-m evo

Its in a case ( grounded ) but easy to get at. Certainly removable.

" What type of CPU cooler are you using, stock or aftermarket? " CPU does not get hot at all, I dont think its drawing much current if any at all. This is a after market cooler though. The oem is available but smaller.

" What about thermal paste? You must use it & it must be applied properly." Its on there.

" Did you confirm your CPU is on the supported list?" yes


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#3
October 28, 2013 at 19:51:20
A few times I've seen that where with the cpu power connected the system seems dead but fans spin when it's not connected. I can't remember if I ever figured that one out. But I don't think it was the cpu as I would have swapped in another to test.

But anyway, since it's a new build, if the PSU has a 110/220 voltage switch make sure it's in the correct position. DON'T GUESS and only change it when the power cord is disconnected.

Also, temporarily disconnect all the drives and remove any unnecessary cards and see if it posts then.


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#4
October 28, 2013 at 19:57:22
Ah crap, sorry to waste your time, or anyone for that matter. Once on the bench I saw the issue. The 4-pin socket ( why I dont know ) was easy to connect the wrong way. Naturally I made a bad assumption that that means correct orientation. Once I saw the hook I knew how to connect it and that I was wrong. I took a real push too? Boots up like normal now.

Thx for the bench suggestion I would have been to stubborn to try that on my own.
issue was: crappy light in room, user error.


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