Just built PC. Nothing on monitor. CPU fan not spinning

So I just built a new PC. The only thing is, when I turn it on, there's nothing on the monitor. Also, the CPU fan isn't spinning.

Antec 900 Case
Corsair TX 650 W
HSI Radeon 6850
some $20 cd/dvd drive
2x 1TB seagate drives (only 1 plugged in because I need to get another sata data cable)
2x 2GB Ram sticks.

If you need more details, just ask.

If anyone could tell me what I can do to troubleshoot, it'd be much appreciated. Thanks!
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More about just built monitor spinning
  1. Update: it starts up but now it powers down on its own after about 1 minute.
  2. Go through this checklist

    also, does it complete a POST? Can you go into BIOS?
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