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My new comp currently refuses to start, and I think I may have narrowed down the problem to the PSU. My rig is running on a A8NE Nforce4 Ultra which uses 24 pins. The psu I got was an Enermax EG495P-VE with a 20 + 4 pin power connector. What I noticed was that the 18th pin on the 20 pin connector is completely absent, the wiring and metal connector aren't there at all. Browsng other forums I found out that apparently my model for whatever reason comes without the 18th pin. Now what Im wondering is, is the missing 18th pin causing my machine unable to boot up (First time I attempted booting up the mobos power light flashed, 2nd time it didn't resposd) or does this board require a native 24 pin connector? Any assistance would be appreciated.

Comp specs:
AMD 64 3000+
Asus A8Ne Nforce 4 Ultra
1 gig corsair value ram
1 Maxtor 200 gig 16 mg cache sata HD
1 LG 16x DVD-R
MSI 7800GT
Enermax EG495-VE
 

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Hi,

If you have the auxillary extra four pin connector, it should work. The 18th pin you are talking about being missing is normal. There is a long explanation for this, but I won't get into that detail. Just be careful to make sure you have the 20 pin connector orientated to the correct side for your 24 pin socket and the applicapable other 12 volt connecters hooked up to the motherboard.

Anyhow, what it sounds to me like is you have a short someplace since it won't light up. If it were mine, here is what I would do:

Take the motherboard out of the case, place it on a piece of cardboard or non-conductive surface beside the case. Plug in only the following: ATX connector, 12 volt square molex plug, (extra 12 volt plug if applicable with this motherboard), the CPU, Heatsink and fan connected to the motherboard, the video card, the off/on switch two wires connected to the front panel header, one stick of ram (check manual for placement slot), the keyboard and mouse, and the monitor. Don't connect anything else....that means no drives, no pci cards, nothing, nada, zip, zilch.....turn it on and see if it stays on. If it does, then add something until you are certain that it is O.K.

If it stays on, then start looking for an extra motherboard post in your motherboard tray, and make sure each lines up exactly to a hole in the motherboard (it is very easy to get one the wrong place), check the sides of the case for a place that the motherboard might be grounding to the case, check the I/O back plate for shorting, and also the PCI standoff covers for shorting to the motherboard. If all is O.K., then start putting it back in the case and test it as you go.

Post back with results.

Addendum: I also wanted to note that some of this brand motherboard with early BIOS's have to have the BIOS updated to accept some of the faster chips. If the BIOS is a fairly new version, you should not have to do this. However, that should not keep it from lighting up as noted in your earlier post. Just wanted to give you a heads up on this one.
 
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