K8N Neo4 (ms-7125 v1) PCI Express Mystery

2 gig DDR dual channel ram
ATI ALL-in-Wonder 2006 PCI-E
1 sata wd 200gig (boot drive)
1 ide wd 160gig
dvd player
dvd burner
I had posted before on this subject, but I'm thinking I was off on the wrong tangent.
To recap. In the middle of the boot process (Windows XP banner displaying) video went dark and bios "no video detected" alarm went off. After this I could occasionally get the machine to start, usually after a reset. Sometimes it would work fine, other times I would get lockups. I thought the video card was bad. Bought a new, identical card. Same problem. I had recently flashed the bios (maybe a week before), I thought that may be to blame. I rolled back to the previous version, made no difference.
If I remove the PCI-E video card and put an old PCI card in, the machine is back to its old rock solid self.
It is looking to me like there is something wrong with the PCI-E bus. The power supply is an Antec 450W "Smart Power".  It has two 12 volt rails, that output 15 and 17 watts. This machine had been rock solid (1.5 years) up to this point, so I doubt it was underpowered. One thing that does trouble me a bit is the fact that when I remove the AC from the power supply it emits a strange noise ( a weird hiss) maybe 4 seconds after I remove the power cord. Maybe it always did this, I don't know. In my imagination I can see a leaking cap that is boiling off electrolyte. Speaking of caps, I closely inspected all the caps on the motherboard and none of them seem to be bloated or leaking.
I tried another power supply. A single rail (20 pin) 350w Sparkle. The video behaved the same (pci-e not detected by bios). I'm not so sure this proves anything because with the Sparkle the system may be underpowered.
Where do I go from here? Did anyone ever hear of the PCI-E circuitry craping out and everything else continues to work?? Could it be the power supply?? I would think if something was wrong with one of the 12 volt rails it would affect both. I would hate to drop $90 on another power supply and find out it doesn't make any difference.
HELP.

The bios alarm is the one long two short, my board manual says that means video card not initialized. The pci-e card was in tight and locked down. Like I said above, I tried a brand new version of the same card, same problem. Since the all-in-wonder 2006 worked for a year and a half without problems, I'm thinking it is not a compatability problem.
I'm now running with a pci card and the system is it's old solid self again. If I look in device manager all the pci-e devices report they are functioning normally. Anybody know of a pci-e bus torture test ??
I've been doing a lot of reading on power supplies. Seems like Antec does not have the quality it used to. Again, I hate to drop the cash for a new ps if that is not the problem. A good one is not cheap. If I am sure the ps is the problem I will go for it. I'm still not sure it isn't a failure on the board itself.

Similar Messages

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    Ok, I'll do my best to remember everything   
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    This can be a stupid question 
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  • K8N Neo4 (MS-7125) northbridge fan replacement?

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  • K8N Neo4 SLi Platinum wireless pci card

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  • K8N Neo4 (ms-7125 ver:1) suddenly won't boot

    please help
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    mem: 1x1gig corsair valuemem and 1x1gig team
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    you are not telling us what you were last doing before it went wrong, believe me that might give some clue, however
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  • K8N Neo4 Platinum 7125 - Switching from Single to Dual Opti - Startup Issues

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    Quote from: Civitas on 11-December-07, 03:28:29
    Reinstalling the operating system seems like awful lot of work if its the power supply.
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    "Reinstalling the operating system seems like awful lot of work if its the power supply."
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    https://forum-en.msi.com/index.php?topic=112039.msg836246#msg836246
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  • MSI K8N-Neo4 and PCI-E x4

    Hi Folks,
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    Quote from: Bas on 09-July-06, 07:25:26
    Those are not different then from what's on the motherboard
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    All I really want to know is if the slot can actually run a PCI-E x4 card or not.  The documentation contradicts itself.

  • 2x K8N Neo 4 - PCI express problem

    Hi,
    I've received 2 motherboard K8N Neo4 MS-7125 and both of them have the same problem ie the PCI express seems dead (bip error indicating a video problem). When I use an old PCI video card, I've an initialization and something on the monitor but I'm unable to boot or access the bios.
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    Quote from: Svet on 04-July-09, 00:32:13
    Not all PCI-E gen2 VGA's can works in PCI-E v1 slots...
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    I'm just surprised to see 2 motherboards with the same 'default' at the same time.

  • PCI Express, K8N SLI Platinum.

    Hello everybody.
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    Hi,
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  • Monitor won't resume from S3 on K8N Neo4

    Put together the signature rig. Installed XP Pro SP2 on SATA with no problem. I have not done any overclocking as yet. Instead of buying a pci-express card, I took the cheap way out (since all my other video cards are AGP, which won't work on this board) & bought a pci video card. Problem is I can put system in S3, standby, & wake with mouse or keyboard, but monitor does not wake up. When I try to resume from standby, fans start, can hear drives start back up, etc. but monitor won't come up. Believe I have bios settings correct, but it's entirely possible that I've missed something which enables a pci video card to wake from standby. Have updated to latest beta drivers for video card. Latest nforce stand alone driver pack from nvidia, stand alone nforce_6.39_winxp2k, won't install. Says pci sys32 drivers corrupted & have to start windows at last known good setting. But I'm not sure if that is the correct version of latest drivers I should install. Anyone running K8N Neo4 with a regular pci video card? Can you bring it out of standby OK?

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