MSI H81M-P33 connectors assembly

[Inet]

I need your help to assemble my board. It's a MSI H81m-p33.

Well, I'm struggling to assemble the connectors on my board.
My case is old, and the connectors also. I've tried various positions of the connectors and only once the pc started, but in a very fast way. The cpu fan accelerate like a mad, and then reduce to a normal speed. By prevention, I turned it off and now it doesn't want to start. I think that is due to the positions of the connectors, particularly the power led connector. So I would appreciate your help.
I send pictures taken with the mobile phone ( sorry for the bad quality), and the mounting schemes.

I connected my speaker to JFP2.
Now look at my power LED connector ( last two ): it has two wires but has three holes and the one in the middle has no wire. If you look at JFP1 scheme, this connector should be stuck in the first two pins, positions 2-4 but in reality it occupies positions 2-4-6, left the position 8-10 for the power switch. But the 10 has no energy! Furthermore: how do you know what is the positive and the negative pin of each connector? The symbols should face to outside or to inside? I would appreciate your help.

 

[geofelt]

A led lead is polarity sensitive.
Look carefully at the plastic, there will usually be a small delta indicating the + lead.
Another convention is that the positive lead will be the colored lead.
No harm will come if you connect them backwards, the led will just not work and you can reverse them.

The second issue is that the pwr led pins are next to each other.
You need to separate the led plastic into two parts to make the connection.
A good knife, a dremel cutter, or perhaps scissors can do the job.

 

[giantbucket]

1 - power and reset switches don't have a + and - terminal
2 - you can ignore the LED for now, but generally the color that is on ALL connectors is the ground (-ve)
3 - use a toothpick to remove ONE of the metal contacts from a connector to move it to an adjacent one if the board expects pin-pin and you have pin-blank-pin. if you look at the opposite side of the black connector (opposite to the writing) you should see small holes, so you push a toothpick in there to release a tiny catch which then allows you to pull the wire out

 

[Inet]

Well, I followed the advice of giantbucket and did not install the power led connector. And...victory!! The pc is finally running!
Now, with calm, I will try to see what is the best alternative: cut the connector into two, or swap one of the wires to the adjacent pin and remove the surplus. I will tell you later the result.
Thanks, to you both.