motherboard problem / PSU problem

By am21
Feb 7, 2007
Topic Status:
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  1. I assembled a system with Gigabyte GA-K8N51GMF-9 mobo with athlon64 3500+ 1gb ram and 250gb hard disk etc

    the problem i faced is failure to POST if kept turned off for few hours (OFF from main power outlet) since i had a warranty i asked my PC assembler to figure out the problem.

    they simply told me that it was a bad PSU and replaced it. this happened 3 times (replaced 3 PSUs)

    actually the same PSU works fine in other systems and it will work in my system if kept ON continuously. i think it is a serious problem with Gigabyte motherboards.

    i did a small research and found these links :

    http://forums.pcper.com/showthread.php?p=3663475#post3663475
    http://www.hardforum.com/showpost.php?p=1028898900&postcount=265
    http://forums.pcper.com/showpost.php?p=3672473&postcount=7

    2 days later.. i asked my PC builder to replace my mobo

    my new mobo model : GA-K8NF9 Ultra(Rev 2.x) nforce4 ultra/SLI
    now i'm experiencing the same boot up problem. i'm currently typing this from my laptop.

    Please advice me regarding this matter.

    more info about my motherboards (comparison)
    http://www.gigabyte.com.tw/Products/Motherboard/Products_ComparisonSheet.aspx?ProductID=1939,2268
  2. N3051M

    N3051M Newcomer, in training Posts: 2,800

    try changing the BIOS battery.

    do you have any electrical problems in your area? spikes, blackouts etc?
  3. am21

    am21 Newcomer, in training Topic Starter Posts: 55

    I tried that too.
    I never had any issues with my 2 year old AMD system. So it cant be an electrical problem :)
  4. .::Cyphon::.

    .::Cyphon::. Newcomer, in training

    tried changing the ram?
  5. Tedster

    Tedster Techspot old timer..... Posts: 10,067   +13

    some motherboards suffer from capacitor failure. Are any of the caps leaking or buldging?
  6. am21

    am21 Newcomer, in training Topic Starter Posts: 55

    It doesn't seem to show any noticeable leakage. I'm sure that it must be a capacitor problem, but how can i prove it to my PC Builder ?

    I have 2x512mb sticks. I tried swapping them and also keeping only 1x512mb :)
  7. .::Cyphon::.

    .::Cyphon::. Newcomer, in training

    Capacitor failure, that IS something i have read about relating to other brands and manufactures of motherboards. Can you please expand on "Caps leaking/bulging" This sounds like it could be a cause for some problems i'm having here:

    http://www.techspot.com/vb/showthread.php?p=395396#post395396


    Also, is there any way of fixing these capacitors, or just dump the board and get a new one?
  8. N3051M

    N3051M Newcomer, in training Posts: 2,800

    Depends on your skill with the soldering iron..

    if you've never heard of that device (the soldering iron), nor touched it before, its better for you to just get a new board (or send it back for an exchange under warranty) but if you're pretty good with the iron (or a friend of yours) then you can replace it with the same type of capacitors (must match). electronics 101...

    But even if you replace them, it won't guarantee it will fix it, as there may be other components that may have already been affected by it. But if you try, its only a couple of dollars to buy those new capacitors..

    Capacitors leaking/bulging is a hardware problem that you can tell straight away by looking at those cylinder looking things on your motherboard. They would sometimes have a funny shape to them out of the norm (top expanded like a balloon) liquid or rust-looking present and some stain the motherboard making it a bit brown over the affected capacitor.

    More info:
    http://cquirke.mvps.org/badcaps.htm
    http://home.earthlink.net/~doniteli/index27.htm
  9. am21

    am21 Newcomer, in training Topic Starter Posts: 55

    I got my PC repaired. The hardware technician told that i had a defective PSU and they have replaced it. They are quite certain that my motherboard is not the cause of this issue. So far everything is working fine.

    PS : i didn't try un plugging it completely from the power outlet.
  10. nickc

    nickc TechSpot Paladin Posts: 1,623

    Well don't unless u have an APC to absorb the impact of not having power. that is never a good thing to do!
  11. am21

    am21 Newcomer, in training Topic Starter Posts: 55

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