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Old 02-13-2012, 02:48 PM   #1 (permalink)
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Default Motherboard or PSU problem?

Hey guys.

This past week i finished a build.

When the moment of truth came (plug it in and turn it on), The computer would turn on for half a second, then just completely shut off for 3 seconds and then repeats that pattern. I'm not too sure if it is the motherboard or the PSU.

I did the PSU test with paper clip. my power supply spun accordingly and consistently. i don't believe that its my power supply but is it still possible that it isn't my motherboard but my power supply? i have yet to test it with another power supply, but i'm a bit lazy. is there another way to find what's wrong?

thanks guys.
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Old 02-13-2012, 02:55 PM   #2 (permalink)
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Default Re: Motherboard or PSU problem?

System specs?

Did you include the 4/8 pin CPU power cord?
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Old 02-13-2012, 05:18 PM   #3 (permalink)
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Default Re: Motherboard or PSU problem?

What motherboard do you have? I actually had another thread here titled "Bizarre Shutdown" where mine was doing something similar. It turns out on my motherboard there was an "LN2_Mode" switch that was causing it. Switching that to off resolved my problem.
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Old 02-13-2012, 05:41 PM   #4 (permalink)
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Default Re: Motherboard or PSU problem?

Quote:
Originally Posted by MindoverMaster View Post
System specs?

Did you include the 4/8 pin CPU power cord?
i didn't include 4/8 CPU power chord.

i5-2500k
1TB WD Black Caviar
AMD Radeon 7970
Newegg.com - MSI P67A-GD65 (B3) LGA 1155 Intel P67 SATA 6Gb/s USB 3.0 ATX Intel Motherboard
Antec 1200
8GB Ram G.Skill 1600
Newegg.com - CORSAIR Enthusiast Series TX750 V2 750W ATX12V v2.31/ EPS12V v2.92 80 PLUS BRONZE Certified Active PFC High Performance Power Supply
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Old 02-13-2012, 05:56 PM   #5 (permalink)
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Default Re: Motherboard or PSU problem?

You need the 8 pin cord, system won't run without it. Right next to your CPU. The cord come with your PSU.
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Old 02-13-2012, 06:54 PM   #6 (permalink)
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Default Re: Motherboard or PSU problem?

I had it plugged in. i thought you mean testing the 8pin with paperclip.
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Old 02-13-2012, 08:09 PM   #7 (permalink)
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Default Re: Motherboard or PSU problem?

Quote:
Originally Posted by flipp1234567 View Post
I had it plugged in. i thought you mean testing the 8pin with paperclip.
better not try that.

I think that you should pull the board out of the case, leave only one stick of memory, cpu/fan/heatsink and nothing else connected to the board. Set the board on a non-conductive surface and connect the power supply, including the 8 pins for the cpu and see if it will post. (temporarily jump the front header pins for pwr sw)
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Old 02-14-2012, 03:39 PM   #8 (permalink)
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Default Re: Motherboard or PSU problem?

okay. i fixed it. i detached everything and reattached it. i think i plugged something in wrong backwards or something.

but now i have a new problem. Monitor won't turn on. Like, its on but no visuals appear. it just says no s ignal. whats wrong with it?

It's a Radeon 7970 xfx as i stated above. could the port be busted? i know the monitor works because i unplugged it from my previous build (2 monitors)
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Old 02-14-2012, 07:18 PM   #9 (permalink)
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Default Re: Motherboard or PSU problem?

You don't see any POST data? The way you describe it is odd. Did you re-connect the PCI-E power cord?
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Old 02-14-2012, 10:44 PM   #10 (permalink)
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Default Re: Motherboard or PSU problem?

I get this info about that 7970 card....
Quote:
Utilization of PCI Express 3.0 bandwidth requires a mainboard equipped with a PCI Express 3.0 PHY. Not all mainboards feature this technology – check with your component or system manufacturer for specific model capabilities.
AMD Radeon


And this info about your motherboard....
Expansion Slots

PCI Express 2.0 x16
2

PCI Express x1
3

PCI Slots
2
Newegg.com - MSI P67A-GD65 (B3) LGA 1155 Intel P67 SATA 6Gb/s USB 3.0 ATX Intel Motherboard
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