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Starting at the begining.
The wall socket, the plug, the cable, the power socket on the SMPS at the back of your PC, the SMPS, the Output connectors from the SMPS to the motherboard.
The power LED not glowing means that the power is not reaching the motherboard. Disconnect and reconnect the power connector on the motherboard. start. No start. Does the fan on the SMPS work? If yes then all components before the SMPS are doing fine. If no then most likely connection socket power cable to the SMPS may be the culprit. This has a lot of load on it. The PC and the monitor both take power from this socket.
the answer to your problem lies in the answer to my question whether the fan starts in the SMPS or not. If yes then there is no output from the SMPS and the SMPS need to be given the due attention and if no then there is no power input to the SMPS and various cables and socketc need that attention.
In case you need to and can remove and open the SMPS look for bulged or burst capacitors. If found, replace them. Those round cylindrical components.
There are No display in your system .Pls remove Power cable from CPU and again plug it and start your system.If display still not comes then pls remove RAM chip from slot in the Motherboard and re-install goods one and check it.if still display not come then issue with Motherboard .Its detter call vendor for repair the Motherboard.
The motherboard LED is supposed to glow, indicating that the board is residually powered, after disconnection of external power and as a warning of this condition so that you will not further disconnect or connect any peripherals until the charge on the power retention capacitor is properly dissipated.
The Power Supply and Processor Fans should only run while power is applied, and if the Processor fan is always running at a high, possibly noisy, velocity, additional Processor Cooling may be necessary by means of a higher efficiency heat dissipation system.
If you remove memory from the board, the system should not initiate, as memory has little or nothing to do with the problems you cite, but everything to do with the proper initiation of your system.
Buy a larger Processor Fan Assembly and those symptoms you cite which actually are problems should cure themselves, while those symptoms you cite which are not problems will still not be problems.
connection to the motherboard as per your query is not critical. you can do trial and error method, since an LED connected in reverse will not damage it, but just show no glow. so just reverse again, if it glows then its okay if still no glow then the LED is dead. Anyway, if you need the manual you can download from this link: http://global.msi.com.tw/index.php?func=downloadfile&dno=3825&type=manual