Faulty PC - No signal on the Monitor, Keyboard and Mouse

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Hello everyone,

I have a PC (HP Compaq dc7900 Small Form Factor) which stopped working. The power light is on and green, the light on the motherboard is also on and green, Power Supply is running, i can tell that from the lights that are on and the spinning fan at the back of the power supply itself.When i plug in the power cable to the power supply the CUP Fan starts spinning and all the lights in the front panel goes on, but there is no display in the monitor, no any signal in the keyboard as well as on the optical mouse. I unplugged everything and started putting back each device one by one, still to no avail. Tried changing CPU, no success.

One question, why is it that when i plug the Power cable to the power supply everything starts running without hitting the power button at the front panel?

I have searched for any similar issue of this PC on the net i found nothing?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References www.computerhope.com/forum/index.php?topic=122607.0

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