Newly Custom Built Laptop shows no sign of life! HELP (new)

Sorry if you saw my other post, i put it in the wrong place, hopefully this is the right place for help. So here is my problem.

Ok, so it is not starting up, i think my problem lies in the front panel connectors, i think i am connecting them wrong. The name of the connector that turns on the computer is called ‘M/B SW’ which is something i havent seen before, no matter where i plug it, it wont work. It will not give a sign of life. If you really need to know my specs here they are:

Intel Core 2 Duo 2.8ghz
2gigs ram 1 stick
500GB green power hard drive.
9800GT 1gb.
300w PSU.

I am pretty sure i connected everything right. This is very frustrating as it is my first build and i thought it was going to be simpler than that, anyways this is why i am posting here.

Any help is appreciated.

Just to clear things up - you mean a custom-built “desktop” not “laptop”, right (I haven’t heard of laptops having a PSU and 9800GTs, but that may be only me…)?