Does a M2N68-AM Plus (Asus motherboard) have to have a cpu fan that has a 4 pin connection? The place I bought the board and cpu today picked out the fan that I needed but it is 3 pin. Can I use the 3 pin cpu fan connector with this board?

first change u r smps if no diffrence problem is same then disconnect all chassis fan one by one and check voltage again.

well those header pins are not any kind of standard, ISO or ATX.
so that is custom work, doing that, and have done this vast times.
the M2n68 manual is clear on that, which each pin does.
but not the HP, HP does not document there super secret pins
if you read there service manual you'd have seen that.
did you first? (yes some high end workstation by HP have this like some of mine)
what is this HP Presario 6313? a relic desktop?
and old desktop?
did you really mean HP Pavilion p6313w Desktop PC
with a "P" and left off the P for fun? I cannot see your service tag so. must guess wild the PC true model and case size options seen on vast models of HP PC. MT, DT, SFF, USFF? or micros sized PC?

ASUS M2N68-AM PLUS this is DIY mobo from them??? bought new in box RAW MOBO
and in same box is the manual too.
the ASUS M2n uses only fans Ausu told you in them manual;
the old PC fans are and new mobo is 4 pins
the 4 pin mobo uses a PWM<modulation pin if missing the fan is dead. lacking such modulation use a 4 pin fan only.
now truth. at HP, here is our mobo not the lick of pin out spec.
on all jacks, fan, f_panel or USB, or power switch there is NONE>
the https://support.hp.com/us-en/document/c01925562

why not buy a new case that just works.? one with 120mm slow quite fans , spend $100 and sell the old dog HP and use proceeds to get a real modern case with real manual and pinouts told.
2009 HP.

try to change your fan proccesor or your power supply adapter for your CPU

Hello,have you installed new motherboard or CPU?
Follow these steps again
1) Disconnect the power cord from the back of the computer & open up the case.

2) Wear an anti-static glove or at very least discharge your static by touching a metal surface or power supply

3) Disconnect the main 20pin ATX power connector from the motherboard & the square 4pin ATX2 power connector

4) Remove any PCI cards you have & disconnect ALL drive cabling from the MOTHERBOARD. Also disconnect any internal USB fly leads from the motherboard.

5) You should now have ONLY the cpu+heatsink/fan, memory & video card installed. Locate the round silver battery in the bottom right corner of the board. Just below it, you'll see a plastic jumper cap. This cap should be covering 2 pins (pins 1 + 2) with pin 3 bare. It will be marked JP1. Move the jumper to cover pins 2-3 instead. Leave in this position for about 30 seconds, then return the jumper to its original position (pins 1-2).

6) Reconnect the square 4pin ATX2 power connector & the main 20 pin ATX power connector. Make sure that the case speaker or buzzer is connected also.

7) Make sure the only external devices connected are the keyboard/mouse & monitor. Reconnect the power lead & power on the system

Let me know what happens

You might have a combination of several small problems. I would like to know whick processor you have installed. But Here is how to get started:

1) Open the case (after unplugging the PSU, not just turning it off). Use a wrist grounding strap or touch the bare metal on the case frequently.

2) Pull the jumper off the 1st two pins of the RTC. Place them on the 2nd two pins for about 10 seconds. Pull them back off and place them back on the 1st two.

Plug the PSU back up and turn on the computer, pressing delete button when the fans come on.

3) This will enter the set up. Check to see if the correct CPU information is listed now. If not, the bios is not old enought to recognize the CPU.

4) activate Asus Update. Go to the site and update your bios from the site. You will have to clear the bios again after the new bios is updated.

5) at that time the motherboard's bios should recognize the CPU. This happens frequently with Asus boards particularly where you have an AM2 board or AM2+ and you are installing a Phenom AMD PCU.

Let me know how this works. There are other things we can do. This is the only thing about Asus boards I dislike.

Sirwriter

You do not use a jumper to run the CPU fan. There will be a small 3 or 4 pin plug near the CPU mount and you can plug the wire from the fan into that plug only. If the one on the motherboard has 3 pins and your plug has 4, you can use it anyway; just be sure the slot on the back of the plug matches the side of the one on the board.

Hi ashwort4,

There could be many things that could stop the board from turning on, Determining if it works is like detective work. What I do, is take everything off the board to start. Then add the minimum to start a board to see if it will start. That's one drive (cd or otherwise) the CPU , and one bank of memory. (that's not a required eliminate, but it helps avoid beep codes) Also, make sure you have your pin's set on the board absolutely correct, or that could be your problem to begin with. Now, you should get the power supply on, and the cpu. If those don't power up, it's then either one of the five elements. The CPU, Power supply, Ram, Drive, or motherboard. The next step is to replace each one of the first four to see if you get any change. If no change, then I usually get another board that I can test the first four, and make sure that they work. After that, then I say you have a DOA Board.

Good Luck,

Mark

Supports: AM2+ Quad-Core CPU/AM2 CPU and 45nm Phenom? II CPU Here is the complete list; your CPU is not listed. http://usa.asus.com/product.aspx?P_ID=2UWzsrOiRbMPGYpw

I guess this is happening because of the CPU getting heated, Kindly check if the CPU heatsink and the fan is seated properly. Also check if there is any power issue, try to connect the system to another wall socket

If your cpu fan has a 4 pin connector & your mb has a 3 pin you can still use it. Just leave one pin exposed. The extra pin is for a speed control sensor that not all mb's support. The chassis fan has a different connector on the board marked "cha fan". This one is a 3 pin connector. Most of the asus boards have 1 of these. If you wish to run more than one you can either buy a "y" adapter that allows you to connect 2 fans to 1, you could use an extra 4 pin molex to power an extra fan but that would give you no control over the fan, or you could buy a fan controller and hook all your extra fans to it. Hope this helps & please take a moment to rate my solution fixya. Thanks.