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Computer won't start when ATX12V is connected


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#1 bullshockey247

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Posted 14 July 2012 - 11:45 PM

Hello, thanks for your time.

I have an HP Media Center m1264n desktop that shut down randomly while I was listening to music and won't turn on. I have another same-model desktop in working order. I figured it was the power supply that died, so I tested my power supply with the other computer and it still worked with the other computer. I tried the PSU from the other computer and it didn't work with mine. I found that the PSU fan runs and the drives light up when the ATX12V isn't connected, but when it is connected nothing turns on. I tried clearing the CMOS but that didn't work. Do I need a new motherboard? Any suggestions would be appreciated.

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#2 S3cS3arch3r

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Posted 15 July 2012 - 07:07 AM

Well, then it is most certainly not the PSU.

Next to check would be the RAM, and the Video Card.
I just noticed HP doesn't ship those desktops with a seperate GPU, instead it is on the MoBo.

A] Disconnect ALL!!! cables, open up your case, disconnect everything that is not needed for POST.
  • (Only PSU, MoBo, CPU, 1 RAM DIMM is needed in your case, so disconnect everything else)
  • (If you added a seperate GPU, disconnect this as well and connect the monitor to the MoBo)
  • (ALWAYS GROUND YOURSELF BEFORE AND DURING THE WORK YOU DO INSIDE THE CASE!!!)
B] Start up system and check if you can reach the BIOS menu.
  • If it works, it's 99.9% certain a GPU or RAM problem.
  • If not, try the other RAM DIMM, and rerty.
  • Still no show, find a video-card that fits your system, connect the monitor to that, and try again.

Let us know,

-Sec

#3 bullshockey247

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Posted 15 July 2012 - 02:05 PM

Well, then it is most certainly not the PSU.

Next to check would be the RAM, and the Video Card.
I just noticed HP doesn't ship those desktops with a seperate GPU, instead it is on the MoBo.

A] Disconnect ALL!!! cables, open up your case, disconnect everything that is not needed for POST.

  • (Only PSU, MoBo, CPU, 1 RAM DIMM is needed in your case, so disconnect everything else)
  • (If you added a seperate GPU, disconnect this as well and connect the monitor to the MoBo)
  • (ALWAYS GROUND YOURSELF BEFORE AND DURING THE WORK YOU DO INSIDE THE CASE!!!)
B] Start up system and check if you can reach the BIOS menu.
  • If it works, it's 99.9% certain a GPU or RAM problem.
  • If not, try the other RAM DIMM, and rerty.
  • Still no show, find a video-card that fits your system, connect the monitor to that, and try again.

Let us know,

-Sec


Hey, thanks for the reply.

I'm a little confused on what you mean for part A (I'm not that knowledgeable when it comes to computers, I tried googling some of it but couldn't figure it out). What am I disconnecting them from? I have the power supply connected to the MoBo with the ATX12V and the ATX power connector, and nothing else connected to the PSU. Do I need to disconnect everything else that's on the MoBo?

If it helps, I'm trying to find everything based on the diagram on here: http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&dlc=en&docname=c00361570&lc=en

#4 coxchris

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Posted 15 July 2012 - 02:40 PM

Hi

Disconnect everything from the PSU expect for the following

Motherboard p1 and atx12v and install 1 ram stick

boot it up

Does it pass POST after your boot

Edit: What this does it let us know what parts to check next if the computer boots.

When you have all of the components in it it wont boot. This test was design to test each component. What were doing its testing the minimal components for start up

Edited by coxchris, 15 July 2012 - 02:46 PM.

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#5 S3cS3arch3r

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Posted 15 July 2012 - 02:57 PM

Hey, thanks for the reply.

I'm a little confused on what you mean for part A (I'm not that knowledgeable when it comes to computers, I tried googling some of it but couldn't figure it out). What am I disconnecting them from? I have the power supply connected to the MoBo with the ATX12V and the ATX power connector, and nothing else connected to the PSU. Do I need to disconnect everything else that's on the MoBo?

If it helps, I'm trying to find everything based on the diagram on here: http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&dlc=en&docname=c00361570&lc=en

No, I meant to disconnect all cables on the OUTSIDE of the case, but you're way ahead of me :P
Leave all cabling on the MoBo as much intact as possible.

As coxchris mentioned, the only thing you need to boot a system are the PSU and a ram module connected to the MoBo, so not even the HDD has to connected to power up the system.

I always disconnect all other components, both POWER (cables from HDD / DVD etc, going to the PSU) as DATA (going to the MoBo), just to rule out any faults in them.



We're just trying to reach the BIOS menu for now...


-Sec

EDIT: spelling

Edited by S3cS3arch3r, 15 July 2012 - 02:58 PM.


#6 bullshockey247

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Posted 15 July 2012 - 03:15 PM

OK haha, thanks. I tried booting with only the 20 pin and 4 pin connected from the PSU to the MoBo which is what I was trying previously but I tried with one stick of RAM and that didn't work, so I tried it with the other stick and that didn't work either. I don't have a monitor hooked up, I'm just going off of the fact that the PSU fan isn't turning on... is that OK?

#7 bullshockey247

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Posted 15 July 2012 - 04:02 PM

I also just noticed that when the 4 pin is connected to the MoBo and I try to turn on the system, the PSU makes a slight noise as if there was a spark or something. I don't know if that's a good thing or not.

#8 coxchris

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Posted 15 July 2012 - 05:22 PM

ok let try to power on without the stick. This will give you a beep code, if this doesn't you have a fault with the motherboard or a bank of ram issue


I also just noticed that when the 4 pin is connected to the MoBo and I try to turn on the system, the PSU makes a slight noise as if there was a spark or something. I don't know if that's a good thing or not.

you have to connect P1 and other ATX12V to the motherboard otherwise you could fried the psu or motherboard

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#9 bullshockey247

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Posted 15 July 2012 - 05:27 PM

ok let try to power on without the stick. This will give you a beep code, if this doesn't you have a fault with the motherboard or a bank of ram issue


I also just noticed that when the 4 pin is connected to the MoBo and I try to turn on the system, the PSU makes a slight noise as if there was a spark or something. I don't know if that's a good thing or not.

you have to connect P1 and other ATX12V to the motherboard otherwise you could fried the psu or motherboard


I tried without any RAM in and still no beeps/fans. When it makes the noise the ATX12V (4 pin) and the ATX power connector (20 pin) are both connected.

#10 coxchris

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Posted 15 July 2012 - 05:32 PM

that means your motherboard is at fault

Does it received power (green LED) is lit

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#11 bullshockey247

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Posted 15 July 2012 - 05:38 PM

that means your motherboard is at fault

Does it received power (green LED) is lit


I don't see any LEDs anywhere- I tried looking this up before but couldn't find anything. Is it possible that there isn't one and there is no internal speaker for it (saw this mentioned a few times in articles I was reading).

#12 coxchris

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Posted 15 July 2012 - 06:28 PM

according to HP website it has (no onboard LED status) no speaker although every motherboard has one one solder or standalone. LED and internal speaker.

According to my experience, that motherboard IMO is dead. now the question is its a Socket LGA 775 which has discontinue so I don't know what would be beneficial to you

1.Replacement is hard to come by because you need to match it exact match or very close to it ebay
2.Buy another computer or build a custom

Let see if S3cS3arch3r has any suggestions for you

Hope this helps and sorry about your motherboard

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#13 bullshockey247

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Posted 15 July 2012 - 06:49 PM

according to HP website it has (no onboard LED status) no speaker although every motherboard has one one solder or standalone. LED and internal speaker.

According to my experience, that motherboard IMO is dead. now the question is its a Socket LGA 775 which has discontinue so I don't know what would be beneficial to you

1.Replacement is hard to come by because you need to match it exact match or very close to it ebay
2.Buy another computer or build a custom

Let see if S3cS3arch3r has any suggestions for you

Hope this helps and sorry about your motherboard



No problem, thanks for the help. I was more curious as to what I had on it/getting my music but I connected the hard drive to another computer so I'm using it that way for now.

#14 coxchris

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Posted 15 July 2012 - 09:06 PM

your welcome :)

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