Computer won't turn on HELP!

Hi,
My computer won't turn on after a few hardware swaps I did.
Parts :
MSI Z77 Mpower, i5 3570k @ 4.0 Ghz, ATI HD4870, Gskill sniper low voltage 2x4gb 1600Mhz, Samsung 840 series 256gb (os), 2x ST4000DM000 (raid 1).
So here's what I did. I shut down the computer, I disconnected every wire with caution to wait for CL_CMOS LED to turn off before pulling the cord. I then switched my ram for Gskill Ares 2x8Gb 1866Mhz (occupying DIMM slots 2 and 4, same ones as my previous ram sticks) and switched my GPU for Asus R9 280x DCUII.
I reconnected everything, CL_CMOS LED powered on. When I pushed the power button, nothing. I pushed and pushed again but nothing happens. I noticed that CL_CMOS LED turns off after I try to push the ON button on my case. When I switch the power off, the LED remains off until it flashes briefly and turns off again.
I've tried putting my old parts back in 1 by 1 but it won't turn on again.
Please help!
edit : old ram timings (CL9-9-9-24, 1.25V) new ram timings (CL10-11-10-30, 1.5V)
edit2 : The lights on my new gpu's pcb were lit during this struggle. Power could come from the pcie adapters though.

Quote from: PirateDog on 22-December-13, 03:02:06
As in Reply #1, keep that configuration and use the switch on the mainboard over to the other BIOS chip. For some reason, it sounds like the one chip may be corrupted or maybe the PSU has become faulty. Double check the security of the 24-pin and CPU power 8-pin connections.
Thanks for your help. I fixed the problem. I am a bit ashamed to say what was wrong but ... the 24 pin connector was loose on the psu side.
I figured it out after 2 days of disassembling/assembling computer and testing components.
Thanks for your help.

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