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Computer doesn't turn on, no led light on MOBO?!

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October 24, 2013 7:26:27 PM

Hello everyone!
My 3 MONTHS OLD custom-built pc doesn't turn on when I push the power button. This happened three times previously, after perfectly normal shut-downs. Usually I would push the power button like mad multiple times, and it would magically turn itself on. Well the miracle is not happening this time...

The motherboard showed no blinking light, nothing inside was running. When tested the PSU, it ran perfectly fine, and powered up a spare PC just fine! I did a power resetting (where one have to unplug the components and hold on to the power button for 20 secs), but no luck. I did check the wire, the power outlet, the PSU switch, everything!

I'm worrying whether the MOBO has gone crazy (though it showed no sign of performance failure, no BSOD, no random crash whatsoever), or it's just a problem with the mere power button.

Please let me know what you guys think! Anything would be helpful, I'm desperate :( 

---- The build---
CPU: AMD FX-8350 4.0GHz 8-Core Processor ($179.99 @ Microcenter)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ Outlet PC)
Motherboard: ASRock 970 Extreme3 R2.0 ATX AM3+ Motherboard ($84.99 @ Newegg)
Memory: PNY 8GB (2 x 4GB) DDR3-1866 Memory ($57.99 @ Best Buy)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.98 @ Outlet PC)
Video Card: Gigabyte GeForce GTX 770 2GB Video Card ($399.99 @ Amazon)
Case Fan: Cooler Master SickleFlow 69.7 CFM 120mm Fan ($2.99 @ Newegg)
Power Supply: XFX 650W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($49.99 @ Newegg)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($14.99 @ Newegg)

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a c 88 V Motherboard
October 24, 2013 7:31:30 PM

I'd test the power_on switch of your case. To do this, disconnect the power_on connection from your motherboard. Use a screwdriver to short the two power_on pins (just touch them both at the same time really quickly). Does this power your system on every time? If so, there is no problem with your motherboard, and the problem is your case's wiring. (If I am understanding your problem correctly).
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October 24, 2013 7:38:43 PM

jimthenagual said:
I'd test the power_on switch of your case. To do this, disconnect the power_on connection from your motherboard. Use a screwdriver to short the two power_on pins (just touch them both at the same time really quickly). Does this power your system on every time? If so, there is no problem with your motherboard, and the problem is your case's wiring. (If I am understanding your problem correctly).

Thanks for your response,
Sorry if this sounds silly but I'm kind of clueless...So do I use the screw driver to tap on the two power pins? What will I be expecting? Would that turn on my computer?
Will a failure of a power button on the case/ or the wiring affect the led light on the mother board?

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a c 88 V Motherboard
October 24, 2013 7:54:42 PM

Yes, if you use the screwdriver to touch both the pins at the same time, it 'shorts' it. It is basically simulating what your power_on switch does by your case.

But, we need to back up a step. I missed the part where you said no LED light on your motherboard. You have both the 8pin and the 24pin power connectors connected to your motherboard, and no LED light comes on? And the power supply works in another system... sounds like a motherboard problem to me if that's the case.
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October 24, 2013 8:30:16 PM

jimthenagual said:
Yes, if you use the screwdriver to touch both the pins at the same time, it 'shorts' it. It is basically simulating what your power_on switch does by your case.

But, we need to back up a step. I missed the part where you said no LED light on your motherboard. You have both the 8pin and the 24pin power connectors connected to your motherboard, and no LED light comes on? And the power supply works in another system... sounds like a motherboard problem to me if that's the case.


Yes that is correct, I have both 8pin and 24pin power cord connected. I really am hoping that dead Mobo isn't the case, because it has been running perfectly fine until I turn off the computer, then it won't turn on again. :(  Anyhow I'll give the screwdriver a shot and get back to you! Thank you :) 
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October 30, 2013 7:44:45 PM

Problem solved! It was the power button that caused this. And it is very strange but apparently this computer's motherboard doesn't have any led light...
On the brighter note- I have switched the wire for the restart button (which functions perfectly find) and will use a pencil to start up my computer from now on!
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