Power supply or switch

By hrlow2
Apr 4, 2009
  1. I recently thought that the motherboard in my machine had died. No power on light on the front panel, motherboard power light WAS on, nothing showing on monitor except a flashing ready light, hard drive not powering up or spinning, no activity of any kind.
    Replaced motherboard with an exact make and model #.When attempting to boot the machine now, the power light on the PSU doesn't light.Whan the power switch is pressed, the PSU comes on for 1-2 seconds then goes off.Does the same thing when pins 14 and 15 are jumped over.
    Tried a known good PSU from another machine. It passed the pin jumper test.
    Once connected to the machine, it does the same on/off thing like the original.
    Suggestions anyone? All welcome.
    Also tried resetting the CMOS,just in case.
  2. Tmagic650

    Tmagic650 TS Ambassador Posts: 17,244   +234

    Make sure the motherboard is not shorting to the case. Try assembling the computer outside the case and see if it boots
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