System Hangs but DVD/fan/kb light still working??

If my system hangs but my dvd drives can still open/close, my casing fans are still running and the keyboard will still light up when I press num lock etc, what is the issue?

To be exact, when my system hangs, ALL usb ports will have no power. Eg, my mouse will not have any light and my thumb drive will not have any light. But everything else including my PS2 keyboard, my casing fans, my dvdrw and my processor fans are all working.

does this means its the PSU problem?
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More about system hangs light working
  1. It probably does, or worse, a motherboard problem. Anyway you can check either on your end?
  2. I noticed that to be exact, when my system hanged, ALL usb ports have no power. Eg, my mouse has no light, my thumb drive has no light. But everything else including my PS2 keyboard, my casing fans, my dvdrw drive and my processor fans are all working.

    I do not think its a PSU problem as this will either cause instant blackout/shutdown, not just hang. I was told it might be a USB problem with my mobo or maybe something to do with the casing.


    I will probably try to run the bare setup outside my casing to see if it works
  3. We will need to know all the components of your system to give more specific suggestions. Check and reseat your power connections. This sounds like a +5V rail problem, so it might be the PSU. What brand and model is it?
  4. The PSU is an Enermax Liberty 500W. Been using this setup without any problems for the past 1 year.

    Processor
    AMD AM2 x2 6000+

    Mainboard
    MSI K9N Ultra

    Graphics Card
    Sapphire x1950 Pro 256MB

    Memory
    DDR2/667 Kingston CL5 3x1GB

    Casing
    CM Centurion 5

    PSU
    Enermax Liberty 500W

    OS
    Windows XP Service Pack 3
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