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Weird problem when turn on PC

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#1
When I press power button, all light on motherboard turn on for a few second ,but no beep, then it auto shut off the whole pc, then it auto turn on again, beep, and boot normal. I don't know why there 's an shutdown after power on the pc first time.
 
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#2
hmm thats strange that it works ok after first time try,,did ya recheck collections and all parts are seated correctly, try and get it working barebones, one stick of ram ect, do yo have another psu to try?
 

P4-630

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#3
When I press power button, all light on motherboard turn on for a few second ,but no beep, then it auto shut off the whole pc, then it auto turn on again, beep, and boot normal. I don't know why there 's an shutdown after power on the pc first time.
I had the same problem sometime ago, but I wanted to overclock the cpu , the pc restarted for the second time and it would only run on default settings.
Did you overclock your hardware?
 
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Processor Intel core i7 3770k @4.5ghz
Motherboard Asus P8Z77-V PRO
Cooling Corsair H80i push&pull with courgar 120mm led fan
Memory 2x8gb Corsair Vengeance 1866mhz
Video Card(s) MSI GTX 970
Storage 1x 512gb Samsung 850 Pro ,1x750Gb Seagate
Display(s) Benq 2420te + Acer S230HL 23"
Case Corsair 760t White
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#4
yes I overclock the cpu,but it just happened a few weeks ago, and I built this pc 2 years ago, the new mobo for at least 6 months.
 

RCoon

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#5
The turn on, shutoff, then turn on with beep is the process the ASRock motherboard takes when overclock settings are changed and then applied. Your motherboard is setting overclocks on startup every time for some reason. Reset your BIOS to defaults, remove and reset the CMOS battery, and then reapply your overclock. You may need to tone it down a bit.

Ensure you test the system at stock clocks and voltages first, to see if it continues to do this after 4 or 5 boots.