RAM slot doesn't work with new RAM stick, Error 55, 4 beeps, won't

z77 slot ASRock's Z77 Extreme9 is equipped with a PLX PCI-Express bridge chip, which adds additional PCIe slots to the board, for a total of six x16. Onboard mSATA slot for mSATA SSDs; PCI Express Gen support; 2-way CrossFireX™ multi-GPU support; HDMI, DVI, RGB; High quality 108dB SNR HD audio;

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