Motherboard not powering up with atx2 (12v) power cable connected

Hi guys! My sister had this old pc I was trying to clean from dust. I disconnected almost all wirings, expansions slots, PSU, CPU and the heatsink then cleaned it.

Now I'm pretty much sure I have connected everything back to how it was but the PC won't now boot! It won't even turn on. No fans no leds no beeps.
At first I thought its the Power Supply but changing it doesn't help it.
Then I noticed that unplugging the 4 pin atx2 power cable (manual says used by P4 processors which my sister has) would make the fans run and power leds on but still won't boot.

I know this is a very old PC but I would appreciate if someone could help me with this.

Here are the specs:
Proc: Intel P4
Mobo: P4VMM2 v8.1
VC: AGP card from radeon.
Memory: an old ram
Power supply: generic

Please note that everything works before I tried to clean it so I doubt it has something to the with the hardware..
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  1. imakuzim said:
    Hi guys! My sister had this old pc I was trying to clean from dust. I disconnected almost all wirings, expansions slots, PSU, CPU and the heatsink then cleaned it.

    Now I'm pretty much sure I have connected everything back to how it was but the PC won't now boot! It won't even turn on. No fans no leds no beeps.
    At first I thought its the Power Supply but changing it doesn't help it.
    Then I noticed that unplugging the 4 pin atx2 power cable (manual says used by P4 processors which my sister has) would make the fans run and power leds on but still won't boot.

    I know this is a very old PC but I would appreciate if someone could help me with this.

    Here are the specs:
    Proc: Intel P4
    Mobo: P4VMM2 v8.1
    VC: AGP card from radeon.
    Memory: an old ram
    Power supply: generic

    Please note that everything works before I tried to clean it so I doubt it has something to the with the hardware..
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