New Build Won't Power - PLEASE HELP

Ok, just plugging in the 4 pin and atx didn't work. I double checked to make sure the power switch was plugged in correctly. Which I know it has to be unless I'm a complete idiot (the little arrow means positive right. I'm gonna go and get a PSU tester tomorrow and see if its that. Any other ideas. HELP.

Here's the checklist (according to my experience) of what you need to power on a system:

1.Power supply set to the correct voltage (if switch is available), plugged in and switched on.
2.Front panel power switch connected to the motherboard (refer to your motherboard manual to make sure which are the correct pins, might as well connect H.D.D. led and RESET)
*Personal note: I once couldn't get a rig to power on and what i had to do in the end was switch the front panel power connection, I think I had the negative in the positive pin and vice versa, so I just switched them around and it powered on.
3.CPU correctly placed in socket with thermal junk and properly mounted heatsink (Just in case it does power on )
4. VGA card properly seated ( if you wanna see if there's a successful POST)
5. At least one stick of RAM
6. ATX and CPU power cables properly connected to the mobo.
7. No drives necessary for power up test.
8. Usually, mobos come with jumpers ready for power on, but you might wanna check with your manual that all jumpers are properly placed.
9. ....and FIRE IT UP.

The absolute bare minimum you need to power up a motherboard and get a POST indication (unsuccessful) is:
PSU, motherboard, CPU and HSF, speaker (if not built onto the motherboard, and a way to turn it all on.

If everything is working, you will get an audible indication of a memory failure. When that happens, power down, insert a stick of memory, and power up again. The next audible indication should be for a video failure - usually a repeating one long and three short beep pattern.

Insert video card. Power up and you should get the standard single short beep of a successful POST.

For more details, see:

http://www.tomswiki.com/page/Troub [...] +New+Build

The usual problem source is the PSU.

Well, I got it working and then the plug in the SYS Fan 2 starting melting the wire, eh. But then everrything started working so IDK. Gonna see if I can load windows. Do I really need the SYS Fan plugged in or is that only if I wanna control rpm. My case has an external control for speed, so I don't think I really need it.

Thanks for all the advice, taking out all the components and checking one at a time really helped.

- Dave

I just wanna thank you guys again, I was going nuts and the I woulda never thought of testing each component separately
(as simple of an idea as it is, it just never dawned on me )

I love this forum, lol, everyone always willing to help.