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Upgrade won't boot

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Hit the power on the new build for the first time last night and nothing on the screen. Fans all running, four led lights on ( green,green,yellow,red ) but that's it.
Reusing case, 700w power supply and optical drives. The rest is new. I know the memory is not on Gigabytes list but not my first mistake. Are they that pickey?

GIGABYTE GA-P55A-UD3 LGA 1156 Intel P55 SATA 6Gb/s USB 3.0 ATX Intel Motherboard (N82E16813128412

Western Digital Caviar Black WD6402AAEX 640GB 7200 RPM SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive(N82E16822136544)

XFX HD-477A-YDFC Radeon HD 4770 512MB 128-bit GDDR5 PCI Express 2.0 x16 HDCP ReadyCrossFireXSupport Video Card (N82E16814150369)

Intel Core i5-750 Lynnfield 2.66GHz LGA 1156 95W Quad-Core Processor Model BX80605I5750 (N82E16819115215)

G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-4GBRL (N82E16820231277)

I will be slow to reply. Using work computer.
Thank you for any help.
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    Tech Staff

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Just a few random thoughts which may help.

1) My very first 1156 board would not display on boot. No POST. After sitting down and double-checking everything, I found that the DIMM slots are numbered differently now. The system would not boot unless I was using slots 1 and 3, so double-check the positioning. From the CPU heading out, it generally is now 2-1-4-3... weird! (I have not made the same mistake since, of course)

2) Double check power is connected properly to the CPU, motherboard, and graphics card.

Disconnect everything not needed for POST and see if that makes a difference.

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