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All fans starts running before system start

Discussion in 'Hardware' started by yukselp, Feb 3, 2007.

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  1. yukselp

    yukselp Thread Starter

    Feb 3, 2007
    I just assembled a new PC. After turning on the power on PSU all of the
    fans (CPU, Graphic card, Case fans) starts running before I hit the
    power button at the front side of the case. I have some difficulties
    with power button also: It doesn't work at the first push. I have to
    try pushing several times with several pressing durations. It seems that
    a 1 or 2 seconds pressing works.
    Also after shutting down windows, all of the fans keep running.

    I changed the original PSU with another, didn't work. Same problem.
    I tried to switch the direction of the power button cable, didn't work.

    CPU: AMD X2 Dual Core 4600+
    Fan: Thermaltake Blue Orb II
    Board: MSI K9N Ultra
    Ram: Kingston 1GB DDR2 800 6400
    Disc: Seagate 320 GB SATA2 16MB
    Graphic: Sapphire X1650XT 256 MB DDR3 PCI-E
    Case: Asus TA231 ATX
  2. crjdriver

    crjdriver Moderator

    Jan 2, 2001
    First of all it does not matter which way the wires go on the power switch pins. You can put them on either way. The only pins that matter which way the wires go are the hd activity, LED, and speaker pins. The reset and power pins do not matter.

    Next I would pull everything out of the case and test with the board on a non-conductive surface; the motherboard box works well for this task.

    Install your video card and connect your monitor, connect the power supply to the board [do make sure any extra power connectors are connected also] Have just the cpu, ram, video, and the ps connected to the board. Use something like a small screwdriver to jump across the power switch pins on the board. If it powers on normally now, you have a mounting problem. If it does not power on normally and you have swapped the ps for a known working one, you most likely have a bad board.
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