Problem with Computer

Hello everyone

i am new to this forum

i need help


my friend (Katrina) has got hold of a computer in the parts of a colleague. She has put together all the parts right, but we still do not get on the computer.
The computer parts that Katrina got hold of are as follows:
 A typical ATX midi-tower chassis.
 A motherboard with an AM3 socket, which must include integrated audio and network card, 4 SATA ports, and a 16x PCIe port
 A PCIe video card
 Two 3.5 "SATA hard drives
 A SATA DVD Drive
 A AMD Athlon processor
 As well as peripherals such as cables, monitor, mouse, and keyboard.
What might have gone wrong? and provide thorough and detailed proposals on how the Katrina can cause computer to function.


Thanks