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[SOLVED] Removed then replaced power supply, now system powers off shortly after powering on.

post #1 of 3
Thread Starter 
SOLVED - Reset CMOS and reseated RAM sticks. Works.


Hi guys,

I took the power supply out of my machine so that I could put it in another machine to test it out. I only used the motherboard and CPU power cables (I only use cables that came with the PSU), because I wanted to check if this other machine POSTed.

Now I have a new problem - I put the power supply back into my old machine (which has been running fine since 2012) and now it turns on, but then turns off about 15 seconds after I press the power button.

I also noticed something new which I hadn't noticed before - the 8 pin CPU connector, which is split into two 4 pin connectors, is as follows, from left to right:

square -> rounded
rounded -> square

and the other one is:

rounded -> rounded
rounded -> rounded



But the motherboard's connectors for the CPU are as follows.

square -> rounded
rounded -> square

next to

square -> rounded
rounded -> square

Is that a problem? I looked it up and the few others that have this problem received mixed answers. Some say that it's for backwards compatibility and it should be fine, others are saying that it shouldn't be done if it doesn't fit (but it does). According to this, it should be fine (scroll down to 4+4 pin 12V power cable). After all I've been using it like this for like four years.

What could be causing this power on/power off cycle?


EDIT: The computer turns on then off in a repetitive cycle without me having to press the power button (except for to turn it on once).

EDIT2: Clearing CMOS has done nothing (maybe I didn't clear it correctly?)

EDIT3: Trying RAM sticks one by one. It's working now, with one RAM slot installed. Will try the others.

EDIT4: Reseated all the RAM sticks and now it's working fine! Thank God!
Edited by Edge Of Pain - 6/29/16 at 12:05pm
Servant of Sigmar
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Servant of Sigmar
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post #2 of 3
Some pictures might help a bit, but it sounds like you are trying to plug the wrong connector into the motherboard 8-pin cpu socket? The shapes of the "pins" on the power connectors have to match exactly with what you are plugging into, shouldn't need to force it at all until the last few millimeters when you're connecting the latch.
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post #3 of 3
Thread Starter 
Quote:
Originally Posted by spinFX View Post

Some pictures might help a bit, but it sounds like you are trying to plug the wrong connector into the motherboard 8-pin cpu socket? The shapes of the "pins" on the power connectors have to match exactly with what you are plugging into, shouldn't need to force it at all until the last few millimeters when you're connecting the latch.

Well, it's working now after I cleared CMOS and re-seated RAM, and has been for four years until now. Plus, the cable only fits into the part of my PSU specifically for powering the CPU, so I'm certainly not confusing it for anything else as far as I know. Didn't have to force it either. Out of interest, are there any cables that are 4+4 pins which go to anything other than the CPU? The most similar thing is the PCIe cable but that's 6 + 2.
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Servant of Sigmar
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Overclock.net › Forums › Components › Power Supplies › [SOLVED] Removed then replaced power supply, now system powers off shortly after powering on.