Why does ASUS M2N-MX mother not start?

Question

Iron

They gave the Windows computer to change, only poked it into the socket and pressed the power button - it started, the first peak was, followed by 3-4 seconds later 2 short ones. There is no image on the monitor, the hard drive spins but then, after a minute, it stops.
There is also a discrete video card GT430 - the situation is similar with it - the first peak, but then not 2 fast ones, but 1. There is also no image. It sounds like the mother goes through the POST
of the ddr2 format RAM twice, when the bar is dragged, the mother, as expected, constantly squeals about their absence. There are 2 bars in total, there are also 2 slots, the rotation of the bars singly and in pairs does not give exactly any result.
signals do not repeat and do not differ in tone and length.
What do these signals mean?
UPD: I preliminarily consider the worn-out PCI Express video card slot to be a malfunction. The PC began to start normally after lifting the video adapter, thereby resting it on the top of the slot.

Answer 1

Well, you can google the signals yourself. Well, you answered yourself. The fact is that the video card does not contact with the pins of the PCI-E slot. Gotta do it.