computer won't start with new motherboard and light won't turn on

[Thagon]

Motherboard light air computer won't turn on after installing new motherboard motherboard type m5a99fx. Possible issues are that I do not have the front panel cables hooked up properly I don't know which ones they are supposed to be stupidly I forgot to take a picture of what they look like before I started trying to work on it. The cables that I have that it could be are as follows a blue cable that says 1394 black cable that says USB and a yellow cable that splits into two both with 5 openings on the top on the bottom three openings before 1 empty space and then one more opening. On that yellow cable it says Azalia and AC, 97. Please help me I have no idea what to do and the instructions that I've been finding aren't very helpful the type of barebone system I'm using is an old Alienware Aurora R1.

 

[CountMike]

It's all marked on MB.
Blue cable that says 1394, that's Firewire, make sure you don't stick it in USB connectors.
Black cable that says USB is to be plugged in USB connectors.
On that yellow cable it says Azalia and AC, 97, one of those (with same pin configuration) goes to Front sound connectors on MB.

 

[unreal9400]

Take a look at the motherboard manual.
It should say which cable goes to where.