Long title, I know. Basically, a friend of mine has a few years old gaming PC (not particularly good, nor does he use it for gaming at all). His power supply is making some crazy fan noises and sounds ridiculous. I was building myself a new computer, and accidentally ordered an extra power supply that ended up costing too much to be worth sending back, so I figured Id let him have it.
Heres the issue I'm running into. His power supply has a 20 pin connector, and then a separate connector for the 4 pin CPU power. The motherboard however is a 24 pin capable mobo.
I plugged in my new powersupply (easily capable of handling that system), but my power supply is a 24pin power, and has no extra CPU 4 pin connector for the motherboard.
I tried just plugging the 24 pin power in, and the system would start but wouldnt POST and there was no video. So I shut it down, and I cut the twist tie locking in the extra 4 pin and plugged it in to the 4 pin CPU power. So now I have the system running off 20 pins (which it was doing before, I figured no problem), and the extra 4 pin from the 24 pin power rail is now plugged into the 4 pin CPU power.
However, I still run into the same issue of it not working. No video, no beeps, no POST. It just powers on, and sits. Can I not use the 4 pin attatched to the 24 pin power connector? I figured it wouldnt matter, since it just supplies power.
No, it is not wired the same. Look on the power supply for a different 4 pin connector if there is not one, then look for a 8 pin connector. The 8 pin will separate into 2 fours and one of them will fit into the cpu plug.
If the 8 pin connector does not split in to 2x4 pin plugs, then it will still plug in (just have 4 pins hanging over the edge of the connector). I've got my 8 pin on a 4 pin plug at the moment in my PC.
If you don't have an 8 pin or 4 pin EPS12V connector, then go buy a proper power supply, anything without one of those is pre-Pentium 4 era and rather aged to say the least!
Thanks alot! This really helped me with my issue. I just bought a psu and upon trying to connect it, I ran into the same problem. I thought my PSU was too advanced for the motherboard. Glad to know I was mistaken. Also glad to know not to follow the advice i read on another site that said that being able to disconnect the 4 pin and putting it into the illustrated slot on the motherboard was the right thing to do.