DIY PC only motherboard light goes on - nothing else happens

Hi! I bought these parts and put everything together. The problem is that only motherboards green light goes on and nothing else happens. I've tried to disassemble and assemble again, but it doesn't seem to help. What should I do next?

Motherboard: P8Z77-M PRO, LGA1155, Intel Z77, DDR3, µATX
RAM: Corsair CMX8GX3M2A2000C9 2 x 4GB, DDR3 2000MHz, 9-10-9-27
Case: SST-ML03B - Milo ML03 Slim HTPC, Micro ATX
SSD: CSSD-F120GB3-BK 120GB Force 3
CPU: Ivy Bridge i5-3570K, LGA1155, 3.4GHz, 6MB, Boxed
PSU: SST-ST50F-ES 500W, Strider Essential, ATX 2.3, 80 Plus
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More about motherboard light happens
  1. Did you plug in the CPU power or Graphics card's power plug? I did this 2 weeks ago, forgot the graphic card's power plug.
  2. did you plug THIS in?
  3. http://www.asus.com/Motherboards/Intel_Socket_1155/P8Z77M_PRO/#MSL

    if the above suggestion isn't the case, i did however find that you're ram is not listed in the list of compatible ram.
  4. Ok, I cleared RTC RAM and it worked. However I have to do it everytime I boot. Bios claims that RAM is only 1 GHz. But on Corsair's website they were claimed to be compatible.
  5. Well, it will default to that speed, you have to activate XMP. And in monitoring programs (not the BIOS) it will show half your RAM speed because it is "double data-rate", thus if it said 1000 in a software monitoring program you would double that and get your actual rate.
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