You can do some troubleshooting on your own. Start by disconnecting all the drives and use only one ram stick at a time to see if one is bad. You can get down to just the cpu/heatsink, video and single ram stick. If it posts, start reconnecting components one at a time. You may have a bad drive, for example. Hopefully, it's not the motherboard.
I really start doing something, i keep out the memories (ram), all pci devices, all hd % floppy cables, i have two cpu and i tested them in to the mother board and its the same, nothing happens, only the display in the monitor that says Pentium 4, but then stop, end begins the sounds one more time, conseguí otra tarjeta madre igual y en esa mis dos procesadores si funcionan bien, el teclado también, pero en la tarjeta madre que yo tengo no, siento que debe de haber una falla o algun circuito que esté dessoldado... thank you