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New rig, Motherboard power LED on but no boot.

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May 17, 2013 12:26:54 PM

Hello guys,

I am new to the 'homemade' PC community and I recently bought parts to build a completely new rig myself. I have installed everything using the internet and manuals but I only get a green power LED on my motherboard. I have tried everything, (Including the standard checklist guide on tomshardware.uk) double check all the connectors, get the motherboard out of the case and place it on a cardboard box, clear BIOS (using the button), MemOk!, using only one RAM slot etc etc but it still does not work. The power LED turns green when connecting the PSU but when I try to start it, it doesn't do anything at all.


Specs:

Mobo: Asus Sabertooth z77
CPU: Intel i7 3770k
CPU cooler: Corsair H100i
SSD: Samsung 256 GB 840 Pro series
RAM: Corsair 2x8 GB 1600 MHz Vengeance
PSU: Corsair AX 650
Case: Fractal Design Define R4
GPU not installed, will get one soon.

I'm a relative newbie when it comes to hardware so I request the help of you experts here

I think that the 'Motherboard' forum is relevant enough to place it here.

I hope that someone can help me, thanks.

More about : rig motherboard power led boot

a b V Motherboard
May 17, 2013 12:37:09 PM

Have you tried shorting the power on pins on your MOBO to see if it starts that way? Also, you will want to make sure you have a fan plugged into the CPU_FAN header.
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May 17, 2013 12:55:18 PM

chugot9218 said:
Have you tried shorting the power on pins on your MOBO to see if it starts that way? Also, you will want to make sure you have a fan plugged into the CPU_FAN header.


I shorted the power pins and already had the CPU_FAN header connected, it still doesn't boot. I have uploaded some pics to give you a view on the situation (Note: The power connector from the case is not connected because I tried to short it)

I guess a imgur link is ok, http://imgur.com/a/JWydB

Thanks for the quick reply
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a b V Motherboard
May 17, 2013 1:03:50 PM

i would disconnect the drive and the cables from it to the motherboard - install the other ram stick (it's Dual channel)

have you made sure your power connections are secure?

------------ UPDATE

I just noticed, based on your picture, that you have the single RAM stick in the wrong slot - taken from page 2-5 of the manual, it should be in the 2nd slot closest to the cpu
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a b V Motherboard
May 17, 2013 1:10:36 PM

Those would be my two first suggestions as well, there could be an issue with the drive/cable/sata port, and your supplemental CPU power may not be fully inserted, I think the light would be indicative that the 20+4 pin is plugged in correctly.

Yes, and as Dingo pointed out, you need to put it in the appropriate slots.
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May 17, 2013 1:15:24 PM

dingo07 said:
i would disconnect the drive and the cables from it to the motherboard - install the other ram stick (it's Dual channel)

have you made sure your power connections are secure?

------------ UPDATE

I just noticed, based on your picture, that you have the single RAM stick in the wrong slot - taken from page 2-5 of the manual, it should be in the 2nd slot closest to the cpu


I have inserted the RAM both single slot and dual slot correctly now, still no boot. Also without the SSD connected not any activity at all.


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a b V Motherboard
May 17, 2013 1:18:02 PM

Did you make sure all your connectors were firm? And you were careful in installing the CPU? I know it sucks removing the heatsink but you might wanna check for damage to the socket/CPU as a last resort, make sure you have some spare thermal paste on hand, and also make sure non leaked off the top of the chip.
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a c 559 V Motherboard
May 17, 2013 1:24:04 PM

Try connecting a case fan to one of the PSU molex connectors. See if the fan does spin when starting the board. If not, then try the paperclip test for power supplies. Make sure that the PSU does work.
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May 17, 2013 1:32:11 PM

alexoiu said:
Try connecting a case fan to one of the PSU molex connectors. See if the fan does spin when starting the board. If not, then try the paperclip test for power supplies. Make sure that the PSU does work.


The PSU fans do not have molex connections, the controller does have one but still no activity at all. The paperclip test is hard to do since all the cables are sleeved black.

EDIT: Case fans, ofcourse
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May 17, 2013 1:34:08 PM

chugot9218 said:
Did you make sure all your connectors were firm? And you were careful in installing the CPU? I know it sucks removing the heatsink but you might wanna check for damage to the socket/CPU as a last resort, make sure you have some spare thermal paste on hand, and also make sure non leaked off the top of the chip.


I checked it really well when I applied the cooler, I will do this when nothing else works at all.
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a b V Motherboard
May 17, 2013 1:40:10 PM

Don't take any offense I am just trying to be thorough, from my knowledge, you simply short the pins inside of the plastic connector for the paper clip test, the sleeved area shouldn't have anything to do with it. Is that what you were trying to do? You could also try removing the 30mm fans from their headers, see if for some reason one of those is causing an issue.
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May 17, 2013 1:48:41 PM

chugot9218 said:
Don't take any offense I am just trying to be thorough, from my knowledge, you simply short the pins inside of the plastic connector for the paper clip test, the sleeved area shouldn't have anything to do with it. Is that what you were trying to do? You could also try removing the 30mm fans from their headers, see if for some reason one of those is causing an issue.


No, I meant that the usually coloured cables are black. I now know which ones I need to short, disconnecting the 30mm fans does not work. Could it possibly be a DOA motherboard/PSU?
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a c 559 V Motherboard
May 17, 2013 1:49:28 PM

Any black pin(in the pinout) would do (ground). Watch the video on youtube. Disconnect all cables from the motherboard when testing. This way you'll know if the power supply does work. Do you have a spare one?
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a b V Motherboard
May 17, 2013 1:51:27 PM

Just follow the pin out he provided, orient it in the same direction as the diagram, and short the green pin to the black one next to it. I think you want everything unhooked when doing this, it will basically see if your PSU can turn on at all. Watch his vid if you need further info. At this point, it is likely the CPU, MOBO, or PSU. The paperclip test can rule out the PSU.
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May 17, 2013 2:03:37 PM

alexoiu said:
Any black pin(in the pinout) would do (ground). Watch the video on youtube. Disconnect all cables from the motherboard when testing. This way you'll know if the power supply does work. Do you have a spare one?


Done, I hear a high-pitched noise, the fan turns on after 5 secs on around 15 RPM and turns down. I will post a vine video in a few mins.

UPDATE: Now the PSU doesn't do anything more at all. Not even the 15 RPM spin. Here is the Vine video. https://vine.co/v/bEFvLDLKVia
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a b V Motherboard
May 17, 2013 2:12:20 PM

Completely turn it off and unplug it, give it a minute or two to discharge it's capacitors, plug it back in and try (the paperclip test) again. If it is still a no go, I would say you have a bad PSU. That seems a little sluggish even without a load on the PSU.
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a c 559 V Motherboard
May 17, 2013 2:18:59 PM

Since the power supply is under warranty, I suggest RMA-ing it.
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May 17, 2013 2:30:48 PM

Retried it after 5 minutes with disconnecting everything, a bleak 10 RPM spin for ~3 seconds then stopping again. I need to RMA it indeed. Thanks for the help guys!

So, RMA?
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Best solution

a b V Motherboard
May 17, 2013 2:34:26 PM

Yeah, that sounds like pretty dismal performance from the PSU, even without a load on it. After that, you are looking at the CPU/MOBO, but PSU is sounding fairly likely.
Share
May 17, 2013 2:45:10 PM

Thanks. I will RMA it to the Corsair point here directly. Thanks for the help guys, I wish I could pick more answers as a solution. I guess this can be closed because I'll open a new topic when my replaced PSU also doesn't work.

Greetings,

Max
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a b V Motherboard
May 17, 2013 2:46:08 PM

Lol good luck buddy, wishing you the best with the new PSU! :) 
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May 17, 2013 5:32:25 PM

chugot9218 said:
Lol good luck buddy, wishing you the best with the new PSU! :) 


I just remembered that the PSU only turns the fan on on about 150W load so I can't be sure if it really is the PSU, I have contacted Asus and I hope that I'll hear something from them.
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a c 559 V Motherboard
May 18, 2013 12:01:34 AM

You have to connect a fan to a molex for the test to be relevant.
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May 18, 2013 5:12:59 AM

alexoiu said:
You have to connect a fan to a molex for the test to be relevant.


Allright, I tested it with a fan and I discovered it will only spin if I put the fan controller on the case to 12V but does work then. I guess that my PSU isn't the problem after all. Is there a way to 'unsolve' this topic?
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a c 559 V Motherboard
May 18, 2013 5:25:12 AM

Solved or unsolved, not too much importance. Do you have a stock CPU cooler?
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May 18, 2013 5:29:30 AM

alexoiu said:
Solved or unsolved, not too much importance. Do you have a stock CPU cooler?


Yes I do.
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a c 559 V Motherboard
May 18, 2013 5:37:07 AM

Then reseat the CPU (inspect also the CPU socket to make sure that there are not bent pins), install the CPU stock cooler and start the board (outside the case) with only CPU and CPU fan installed. Make sure both 24 and 8 pin cables are connected. See if the CPU fan does spin.
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May 18, 2013 6:41:17 AM

alexoiu said:
Then reseat the CPU (inspect also the CPU socket to make sure that there are not bent pins), install the CPU stock cooler and start the board (outside the case) with only CPU and CPU fan installed. Make sure both 24 and 8 pin cables are connected. See if the CPU fan does spin.


Tried it, I had some spare thermal paste. The CPU and pins are in perfect state. The CPU fan does not spin. Reconnected everything. Still the green power LED is the only thing that works.
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a c 559 V Motherboard
May 18, 2013 6:45:09 AM

Then, if the CPU fan is connected to the CPU_fan header and 24 and 8 pin cables in place, I'd say it's a motherboard issue.
Can you borrow though a power supply, or test yours in a different system?
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May 18, 2013 7:01:15 AM

alexoiu said:
Then, if the CPU fan is connected to the CPU_fan header and 24 and 8 pin cables in place, I'd say it's a motherboard issue.
Can you borrow though a power supply, or test yours in a different system?


I can test my system in a few hours. . I also installed a system speaker but no sound. I'm getting a bit hopeless.
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a c 559 V Motherboard
May 18, 2013 8:16:36 AM

You can't get beeps as long as the CPU doesn't get power. It's either a power supply or a board issue.
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May 18, 2013 8:24:32 AM

Update: I tried to flash the BIOS and the blue LED on the flash bios does light up and flashes when I 'flash' it but it the system still gives no sign of life.
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a c 559 V Motherboard
May 18, 2013 8:26:21 AM

There's a problem with the 8 pin power cable (the one that powers the CPU). What connector using?
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May 18, 2013 9:48:56 AM

alexoiu said:
There's a problem with the 8 pin power cable (the one that powers the CPU). What connector using?


The splittable 2x4 pin (With a solid 8 pin at the end to the PSU)
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a c 559 V Motherboard
May 18, 2013 10:14:28 AM

Hard to say. Try though testing the PSU firstly.
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May 18, 2013 11:14:06 AM

alexoiu said:
Hard to say. Try though testing the PSU firstly.


Connected the CPU cooling and other fans, they all work when I short the PSU. Gonna test the PSU at a friend tomorrow to be sure. Maybe it is indeed a DOA motherboard? I can't even short the case LED's.

Here is another vine video https://vine.co/v/bEV2HnWpQB5
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May 19, 2013 8:51:35 AM

Alright. Tested the PSU at a friend, works 100%.
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May 19, 2013 8:51:39 AM

Alright. Tested the PSU at a friend, works 100%.
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a c 559 V Motherboard
May 19, 2013 10:56:56 AM

Then all that remains is the motherboard.
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July 8, 2014 8:23:53 AM

I have the same problems and I got a new motherboard and new ram. So I'm think my psu went bad.
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!