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Custom built pc turns on and off and on again

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Last response: in Systems
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August 22, 2013 2:08:13 PM

I built a new computer recently. It is my first build. I finally came down to use for the first time (never used before so no drivers installed yet) i turn it on and the monitor shows up blank with no signal. Then after about 8 seconds the computer shuts down and turns on again. I took a look inside and saw that the cpu cooler light turns on and so does the motherboard's on, reset buttons and a number display that shows 55 when its on. the cpu cooler light turns off after 8 seconds along with the number display on the motherboard, but the power button and reset button on the motherboard stay on. So far I've tried taking out the ram and trying it slot by slot (to no avail).

the parts are:
ASRock Z77 Extreme4 LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard

XFX FX-795A-TNFC Radeon HD 7950 Core Edition 3GB 384-bit GDDR5 PCI Express 3.0 x16 HDCP Ready CrossFireX Support Video Card

Patriot Signature 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory with heatshield Model PSD38G1600KH

COOLER MASTER GX Series RS750-ACAAD3-US 750W ATX12V v2.31 SLI Ready 80 PLUS BRONZE Certified Active PFC Power Supply

SAMSUNG DVD Burner 24X DVD+R 8X DVD+RW 8X DVD+R DL 24X DVD-R 6X DVD-RW 16X DVD-ROM 48X CD-R 24X CD-RW 48X CD-ROM SATA Model SH-224DB/BEBE - OEM

COOLER MASTER Seidon 120M RL-S12M-24PK-R1 Performance All in One Liquid/Water CPU Cooler

WD Blue 1 TB Desktop Hard Drive: 3.5 Inch, 7200 RPM, SATA 6 Gb/s, 64 MB Cache - WD10EZEX

2 of Cooler Master Blade Master 120mm Computer Case Fan (R4-BMBS-20PK-R0)

Core i5 3570K 3.4GHz Socket LGA 1155

Carbide Series 200R Mid Tower ATX Computer Case

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August 22, 2013 2:38:24 PM

Some possible causes (the error is memory related, if I'm not wrong):
-RAM module not properly inserted (all the way in)
-case/standoffs shorting the motherboard
-faulty/not compatible RAMs
-bent pins (CPU socket).
I suggest testing the board outside the case. If still the same, try reseating the CPU and inspecting the socket for bent pins. If all's OK, try borrowing a RAM stick and test.
!