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Did I Kill My Motherboard (Asus P9X79)?

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March 27, 2014 9:41:10 PM

I just put together a computer with an Intel 4820K and an Asus P9X79 motherboard. I heard that I'd probably have to update the BIOS so I just powered it up to see if it would start and it did quite nicely.

My power supply (a 4 year old 850 watt Diablotek -- the new 430 watt I recently purchased is 20 watts underpowered according to the Asus manual) has a four pin CPU power connector and the Asus board has an 8 pin. The instructions stated to put a single four pin connector into the right most pins however the cable was severely stretched. Along with the motherboard came an 8 pin extension that matches the CPU power connection. I plugged that into the motherboard then plugged the power supply into the corresponding socket (on the right most side). After plugging it back in and powering up I get nothing but a high pitched whine. No LEDs on the board light up at all. I shut it down and unplugged it then set it up as I had it when it was working but I get the same results. Did something get fried? There was nothing in that manual warning against doing this. Could it be the power supply (I hope)?

I'm feeling a bit desperate now. Any help or advice would be deeply appreciated.
a b V Motherboard
March 27, 2014 9:45:23 PM

You should be able to use the 430watt psu to test with, just plug the cpu/cooler and some ram in and see if it starts with the 430w psu.
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a b Ĉ ASUS
a c 120 ) Power supply
a c 254 V Motherboard
March 27, 2014 9:45:57 PM

Diablotek is an atrocious brand. I'd suggest getting a decent one from the second link in my sig.

A 430W might be OK if it's reasonable quality and you're not stressing it. OK for testing, don't use it long-term.

Try it off the 430W.

EDIT: Read through here.
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March 27, 2014 10:19:57 PM

The 430 watt is a Corsair CX430M. I just tried it out but I'm not even getting the standby power LED to light up.
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a b V Motherboard
March 27, 2014 10:20:51 PM

that is not very encouraging.
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a b Ĉ ASUS
a c 120 ) Power supply
a c 254 V Motherboard
March 27, 2014 10:23:07 PM

Read the thread I linked, but yeah, that's worrying.
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March 27, 2014 10:25:43 PM

Sounds dead? I can't believe that using the extension could kill it, I'm guessing possibly the processor too. Thank you and Someone Somewhere for your quick replies though. Tomorrow I'll contact Asus and see what they think but I'm not feeling optimistic.
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a b V Motherboard
March 27, 2014 10:28:03 PM

Do you have a second mobo you can try that in?
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March 27, 2014 10:45:46 PM

Unfortunately I don't. My other computers are old socket 775 machines. At this point there doesn't seem to be any other options but to try to get some sleep and contact Asus in the morning. My internet connection keeps skipping out on me too. This clearly isn't my day. Maybe tomorrow will be better. Thanks again.
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a b V Motherboard
March 27, 2014 10:47:22 PM

Well that is a bummer, good luck with Asus, and remember you should probably ditch that Diablotek PSU and stick to more reliable units, they may cost more but they are definitely worth the money.
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March 27, 2014 10:48:14 PM

Also: I favorited the PSU list and when the time comes I'll make my selection from there. :) 
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a b V Motherboard
March 27, 2014 10:51:12 PM

Great idea
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a b V Motherboard
March 28, 2014 12:44:55 AM

You mentioned hearing a high pitched whine.. where does it sound like it's coming from?

Check the motherboard for blown capacitors.

Picture of blown/working capacitor here:

http://forums.pelicanparts.com/uploads19/close+up+1+132...

Try the other power supply you mentioned. Does this power supply also not cause the motherboard LED to light up when plugged in? Also, the 8 pin extension probably spits in half, most 8 pins EATX12v plugs do.
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a b Ĉ ASUS
a c 120 ) Power supply
a c 254 V Motherboard
March 28, 2014 1:44:14 AM

It won't be the extension; it could be a crap PSU.

Do the stuff in the thread before contacting asus.
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March 28, 2014 6:35:18 AM

I haven't contacted Asus yet but I did just think of something encouraging. Years ago I had a P4 that had a bad power supply and would let out a whine when I moved the mouse (or something odd like that -- it was a long time ago). Replacing the PSU solved it.

As for this one (the Corsair), like it says, a new power supply isn't a proven power supply. It might be DOA so no standby LED. I might bring it into a store for to see if it works, Best Buy or Micro Center. The Diablotek is from one of the 775s and the other 775 also has a Diablotek. I'll also see if any of my friends have one they can spare for a few hours.

I'm also gonna step through the No Post list again more thoroughly and check for blown capacitors before anything else.

Thanks again!
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a b Ĉ ASUS
a c 120 ) Power supply
a c 254 V Motherboard
March 28, 2014 6:38:39 AM

Got a multimeter?

Yeah, that sticky is really useful. I hate to think how many times I'd be writing stuff like that out without it.
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Best solution

a b V Motherboard
March 28, 2014 10:40:45 AM

It is probably the PSU making that sound as I couldn't imagine the motherboard making a whining sound, the motherboard might make a popping sound and a fan might possibly whine if it is broken. You could also get a cheap ATX tester for that PSU for around 10 bucks for future use, those are quick and easy to use.
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March 28, 2014 3:14:14 PM

Thank you for all the information. I'll definitely look into an ATX tester (I've never heard of it before so another bright side is the learning experience). I don't have a multimeter but a friend of mine who rewires electric guitars will have one and will definitely help me out. I read through the post that states what the PSU's voltages should read so I'll copy that and bring it to him. I'm hoping that the motherboard is salvageable (or at least the CPU) but I'm prepared for a worst case scenario.

Blaming that extension made me feel a little less foolish for a short time but in the long run it'll probably have the opposite effect ;) 

Thank again!
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April 2, 2014 4:00:59 PM

I had to take some time away from it. I picked up a 500 watt PSU (an EVGA 500B -- the reviews were mainly positive) and it posted like I never screwed things up in the first place. :) 

I still have to update the BIOS and load the OS but otherwise it looks good. It recognized the CPU and all of the RAM (one of the CPU fans is running slow but I saw a few threads on that subject).

Thank you again for your help! I'll check here first from now on when I have hardware questions.
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