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Asus p8z68-v Pro won't post

post #1 of 14
Thread Starter 
Hello,

Just got all the bits for my new build today (some new, some used, some I already had).

Asus p8z68-v Pro
Intel i7-2600k
Kingston HyperX 1600 2x4GB
HIS 6950 2GB
Corsair vx550

Anyway, I put it all together and it won't post. There are no beeps (I've got the speak plugged in), there are also no LEDs. The fan on the heatsink (freezer 13 pro) spins for about a second, then stops.

The only lights are a green power symbol button on the motherboard (I press this to try and start the computer) and a red restart button, although the colours might be the other way around, I forget. I've tried pressing and holding the RAM button; it flashes red once if there's ram in there, the fan spins for about a second then stops.

Both power cables are plugged in. I've tried with and without memory, as well as with just 1 stick. Tried with and without the processor. Tried with and without graphics card. I've tried testing it with the board on an antistatic surface to avoid a short circuit, and with the PSU and the motherboard on an antistatic surface; same results.


The power supply should be fine as it was in my old (current) PC this morning and working fine. However, when I tried putting my old PC back together after I failed with the new one, the old one won't post either. For reference it's a GA-P35-DS3P and again, was fine earlier this morning and for the past 2 years. The old PC has the same problem: no LEDs, no beeps and fans spin for about a second.


What are your opinions? Is the power supply at fault? Could it have been damaged during transition between cases? I got my father who has a degree in electrical engineering (so I guess he knows what he's looking for) to have a look at the inside of the power supply, he said he couldn't see anything obviously wrong with it.


P.S. I have also posted this on tomshardware, so if I get any more info from there i'll share it here too




EDIT: Turns out it was a dead power supply, swapping it for a working 850 watt one made it spring back into life.
Edited by led-zeppalike - 11/2/11 at 5:27pm
post #2 of 14
I am 100% confident it's the power supply. Nobody around here would have recommended you plug a new system into that PSU anyways, especially if you've had it a while. 600-650W should be your minimum, from a good builder.

Someone may chime in and say 'system should run on that' but, at 2 years old, who knows.
Edited by keto - 10/29/11 at 3:52pm
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post #3 of 14
Thread Starter 
Quote:
Originally Posted by keto;15502069 
I am 100% confident it's the power supply. Nobody around here would have recommended you plug a new system into that PSU anyways, especially if you've had it a while. 600-650W should be your minimum, from a good builder.

Someone may chime in and say 'system should run on that' but, at 2 years old, who knows.

Thank you, this is what I was hoping. I'll probably buy a 750 watt supply to be on the safe side.

Is there any reason I shouldn't have plugged it in other than it probably being under the required wattage? I did test my 'old' PC with the new graphics card before building and it worked OK.
post #4 of 14
That rig should operate fine on a 550 Watt, but you should get a bigger one for upgrades in the future.
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post #5 of 14
I just bought a P8Z68-V LE (New) today from Frys. Apparently mine does the same thing, computer starts up with the fans running and turning off about a couple seconds, then coming back on and off again. Even when I thought I fixed it, where the BIOS finally comes on, it crashes as soon as I see the 4 balls of Windows 7 coming together. I've looked around and it seems that the P8Z68-V (pro or nonpro) has this problem commonly.


http://www.tonymacx86.com/viewtopic.php?t=30638&p=194558
http://www.tomshardware.com/forum/293696-30-asus-p8z68-restart-problem-startup


What I have noticed about Frys when I went there today was there was a lot of Returns of these P8Z68 motherboards that they checked and put back on shelf. Mine was a new one so Frys never checked it so I might have ended up with a bummed one. So tomorrow I'll go return it along with the i5-2500k and ask if they can test it out in front of me.

I was using the same parts you see in my rig, except it was the i5-2500k and I was using it on a 500W PSU. Switched to a 650W and problem was still there. The i5 uses less power than my 965...
Edited by Kiros - 10/29/11 at 8:54pm
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post #6 of 14
I never thought, I'm so used to it...are you giving it a minute or so to boot up? Most of the 67/68 chipset boards do a 'false start' - fans spin up then spin back down, but then if you wait a few secs it does go ahead and boot. Occasionally (failed OC or?) it will even do it multiple times. Some people point fingers at ASUS, but that's just because there are more of them. My Gigabyte Z68 did exactly the same thing and if you look around, boards from other mfrs do the same.
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post #7 of 14
I believe the "boot loop" problem is a "feature" of the p67 and z68 chipsets. I don't think it's limited to any specific manufacturer. Here's a quick search on the matter so that you can see what I mean. http://www.google.com/cse?cx=partner-pub-0500457209104480%3Aw4uakiy7wkk&ie=ISO-8859-1&q=boot+loop&sa=Search&siteurl=www.overclock.net%2Fintel-cpus%2F968053-official-sandy-stable-club-benchmarks-stable.html#gsc.tab=0&gsc.q=boot%20loop&gsc.page=1
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post #8 of 14
Thread Starter 
Thanks for all the suggestions. I've tried it again in the P35 build this morning and it still does the same thing. I'll rebuild the z68 build later on and try it again to test for the boot loop thing.

I understand there might not be enough power going to all the components, but how would this have made the old P35 build stop working?

Thank you
post #9 of 14
If the PSU is the common thing between both systems, I'd guess and say that's your problem. You don't need a 650 or 750w unit though. A good 500w is more than sufficient for either of your machines just fine.

If that 550w Corsair that you've had is relatively old though, it could simply have just died from old age. Take Corsair up on their RMA service. wink.gif No reason to buy a new one.

Might want to RMA your board while you're at it too. It's possible it came in DOA, causing the PSU failure to begin with.
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post #10 of 14
Thread Starter 
Quote:
Originally Posted by pioneerisloud;15506934 
Take Corsair up on their RMA service. wink.gif No reason to buy a new one.

Well I regret taking a look inside the power supply now lol. I wonder if it's possible to buy an intact 'Warranty void if removed' sticker anywhere doh.gif
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