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    PC won't boot, only motherboard lead light on


    I am rebuilding an old PC. When trying to boot the first time the motherboard onboard power led lights up and nothing else happens.

    The power supply fan doesn't start
    The CPU fan doesn't start
    The chassi fan doesn't start
    No reaction from the screen
    No reaction from the mouse
    No reaction from the keyvoard

    My setup is:

    Motherboard: ASUS M4A785TD-V EVO, Socket-AM3

    CPU: AMD Phenom II X4 945

    Memory: 2 matched pairs Corsair XMS 4096MB DDR3 PC3-10666 1333MHz (9-9-9-24) (2x2048MB) (TW3X4G1333C9)

    Power: 500W Seasonic nätdel, ATX, EPS12V, BTX *

    Disk: Western Digital Caviar Green 1TB (IntelliPower / 64MB Cache / SATA II / NCQ)

    I have done the following checks:

    Tested the powers supply

    I measured all output with a voltage meter and they are OK.

    Cleared CMOS

    Turned onboard battery upside down (recommended by Asus)

    Removed all connections to disks and dvd

    Still no effect. Only the onboard power lights lights up.
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    Additional info


    Originally Posted by Botul
    I am rebuilding an old PC. When trying to boot the first time the motherboard onboard power led lights up and nothing else happens.

    The power supply fan doesn't start
    The CPU fan doesn't start
    The chassi fan doesn't start
    No reaction from the screen
    No reaction from the mouse
    No reaction from the keyvoard

    My setup is:

    Motherboard: ASUS M4A785TD-V EVO, Socket-AM3

    CPU: AMD Phenom II X4 945

    Memory: 2 matched pairs Corsair XMS 4096MB DDR3 PC3-10666 1333MHz (9-9-9-24) (2x2048MB) (TW3X4G1333C9)

    Power: 500W Seasonic nätdel, ATX, EPS12V, BTX *

    Disk: Western Digital Caviar Green 1TB (IntelliPower / 64MB Cache / SATA II / NCQ)

    I have done the following checks:

    Tested the powers supply

    I measured all output with a voltage meter and they are OK.

    Cleared CMOS

    Turned onboard battery upside down (recommended by Asus)

    Removed all connections to disks and dvd

    Still no effect. Only the onboard power lights lights up.
    After turning onboard battery upside down, I replaced it with the original polarity
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    Have you connected your ATX connectors properly? Some motherboards use all 24 pins inside of 20 why it might be lacking from power. Also did you make sure your Power SW, RESET SW, Power Led etc are connected in their right pin?

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