Problem

K1LLSW1TCH

K1LLSW1TCH

K1LLSW1TCH

Caporegime
Joined
12 Mar 2009
Posts
26,778
I've just taken my PC apart for a clean and a rearrange of the cables, it needs a good tidy in there, anyway, upon reassembling I have an odd problem, the PSU, CPU and GPU fans all spin up to full speed. Because my PSU only has one 6 pin power connector and my graphics card requires two I'm using an adapter, so I've got the standard PSU's 6 pin connector going straight from the PSU to the graphics card, and then I have the adapter, 6 pin in one end of the graphics card and two molexes coming off that which should plug into the molexes which are left free on the PSU.

I've had this working for months and only now I'm having a problem, I'm pretty sure it's something that I'm doing and I'm also fairly sure that it's something to do with the graphics card. If I remove the graphics card from the setup then things work just fine so I assume I'm plugging it in wrong. Pics are below and help is greatly appreciated. If any more info is required just ask as I'll be monitoring the thread closely. The GPU is a 5850 and it's a Zotac 9300 mini itx board.

As you can see in the second image I have the 6 pin power connector plugged into one of the slots on the graphics card, and I have only one of the molexes plugged in, if I plug both in the system doesn't power up, if I plug the yellow cabled molex into the one with the sleeving then the system doesn't power up. It seems the only way it powers is if I plug the black wired molex into the sleeved molex. One this that I'm a little bit wary of is that when I took the system apart I think one of the pins came out of the ends of one of the molex connectors and without looking which one I just pushed it back in, I'm not sure which one it was and if anyone needs images of the ends of all of my molexes I can do that.

HALP!! :( :(

IMG_0003.jpg


IMG_0002-1.jpg


IMG_0001.jpg
 
could it be too many amps on one rail? Try all the combinations of Molex to see if it works. Swap for the hard disk ones.
 
aaron333 said:
I'd say PSU not providing enough juice.

What PSU is it?
Click to expand...


The PSU is fine, as I said in the OP I have been running this for months, the problem has occured since I took everything out of the case and re-assembled. It's the PSU that comes with the SG05, it's 300W but the PSU's are actually pretty good. There have been no performance issues at all, add to that I'm only using an E8400 it's hardly power sapping. It's been fine since I built the system in May, I'm adamant that the problem is something to do with the Molexes. :)


nkata said:
could it be too many amps on one rail? Try all the combinations of Molex to see if it works. Swap for the hard disk ones.
Click to expand...

Tried, but I shall re-try, any more ideas? :)
 
With PC running, (without graphics if necessary) check molex outputs with multimeter, I will admit 300W seems a bit low however if it was running before, it should run now. Check for possible earth leaks, short circuits
 
nkata said:
With PC running, (without graphics if necessary) check molex outputs with multimeter, I will admit 300W seems a bit low however if it was running before, it should run now. Check for possible earth leaks, short circuits
Click to expand...

Not sure what's changed to be honest, everything is wired up the same as it was before, I've tried all combinations of molex and still the same problem, I'm ready to throw the bloody thing out of the window. :mad:

Think I'm gonna have some food, remove everything and start again, if you can think of anything else then I'm all ears. :)
 
whipitrnd said:
hmm could be psu not enough power. you do need 500 + psu
Click to expand...

You don't because it's been running for 2 months. :p

Also, check out the SFF subsection, many people have used this gfx card with this PSU, there's someone in there running a quad core and this graphics chip with that PSU.
 
I'm confused by the images you've taken. You seem to have the Molex to 6 pin connector connected but the connector only seems to have two blacks in it. These blacks are ground only.

I can see in the second and third image that you've plugged in the molex with the two blacks, which is fine but still have the one with the yellows loose and not connected to anything.

The +12v in a PSU is a yellow coloured lead so that would need to be connected to the power supply via a molex.

These types of connectors do not have pass throughs like so many others.

Connect the loose connector to another PSU molex and see how you get on.

If you already did this after taking the pictures then forget this message.
 
Tealc said:
I'm confused by the images you've taken. You seem to have the Molex to 6 pin connector connected but the connector only seems to have two blacks in it. These blacks are ground only.

I can see in the second and third image that you've plugged in the molex with the two blacks, which is fine but still have the one with the yellows loose and not connected to anything.

The +12v in a PSU is a yellow coloured lead so that would need to be connected to the power supply via a molex.

These types of connectors do not have pass throughs like so many others.

Connect the loose connector to another PSU molex and see how you get on.

If you already did this after taking the pictures then forget this message.
Click to expand...

Those pics were taken just to show which connectors I had in total. I've only got two free molexes coming from the PSU and I have a 6pin PCI-e power connect to molex converter, it's the 6 pin on one end with two molexes on the other which I'm plugging into the two free molexes coming from the PSU. Does that clear it up or am I still doing something wrong? :)

Just re-read your post and to clarify, when only the blacks are connected everything powers on like normal, except at full speed, all fans are blasting, if I plug the loose yellow one in then the machine fails to power up at all.
 
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When I leave the pci-e connectors off on my 4890 the fans run at full speed too. The blacks are doing nothing, you'll probably find similar behaviour if you left the black wired molex disconnected too.

Do you have an alternate molex to pci-e connector cable? Yours doesn't look like the ones I've seen. I know it used to work for you but it's just odd that it would stop working.
 
In your 3rd picture it shows a yellow wire going into one of the middle two which should both be black. That adaptor is very strange, I would definately recomend getting a new one...
 
Oh yes, it's almost as if a yellow lead popped out if the connector and you stuffed it back in the wrong place.

At least it's not plugged into the 5v line, not wholly sure what a graphics card would make of 5v coming instead of 12v goodness.
 
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