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P8Z68-V Pro Power Up Issue

post #1 of 15
Thread Starter 
Okay, so here's my issue: the PC I recently built has been switching on for a few seconds and then switching back off before switching on again to POST. Clearing the CMOS by moving the jumper from pins 1-2 to pins 2-3 for 30 seconds or so used to fix it (although I'd need to do it again every time the PC loses power) but now a CMOS reset won't cut it. Soft reboots don't have the issue and while it really isn't life threatening, it adds significant seconds too boot up times which is what I've been trying to cut down on with an SSD.

Any help would be appreciated.

NOTE: The only BIOS settings I've messed with are loading optimised defaults and changing CPU FAN prolfile to 'Turbo'.
post #2 of 15
Ok you should disable PLL overvoltage and it will fix it ! it's a known Asus motherboards bug.
post #3 of 15
Sounds like you're also having the same problem I am in my thread (Clicky)
The consensus over there seems to suggest updating to the latest BIOS version.

Quote:
Originally Posted by TerrabyteX View Post
Ok you should disable PLL overvoltage and it will fix it ! it's a known Asus motherboards bug.
TerrabyteX, isn't the PLL overvoltage needed to achieve higher stable clocks? I've got mine as enabled and was under the impression that the higher clocks required it on.
Edited by 5nak3 - 11/9/11 at 1:34am
post #4 of 15
Thread Starter 
Quote:
Originally Posted by 5nak3 View Post
Sounds like you're also having the same problem I am in my thread (Clicky)
The consensus over there seems to suggest updating to the latest BIOS version.



TerrabyteX, isn't the PLL overvoltage needed to achieve higher stable clocks? I've got mine as enabled and was under the impression that the higher clocks required it on.
My BIOS is at 0501 so I'll download and flash to the latest via the AI Suite and let you know.
post #5 of 15
Yeah, I'm running the same BIOS, however as I stated in my thread I'm going to have to wait till the weekend to try.

If you want tips on the flashing be sure to check out the replies from Sean Webster and Munaim1 as they give some very good tips to help with the flashing.

Best of luck!
post #6 of 15
Thread Starter 
Quote:
Originally Posted by 5nak3 View Post
Yeah, I'm running the same BIOS, however as I stated in my thread I'm going to have to wait till the weekend to try.

If you want tips on the flashing be sure to check out the replies from Sean Webster and Munaim1 as they give some very good tips to help with the flashing.

Best of luck!
Well looks like the AI Suite can't find the BIOS files from the servers. I'll manually download 902 and backup my old BIOS in case, then flash with the AI Suite.
post #7 of 15
i have updated my bios to 0801 and it didn't fix. just try what i say ! disable pll overvoltage ! And yes it is need for multi 50x ( 5ghz and up ) . I don't need it for 4.8 or 4.9 ghz.


How to flash your bios. if u have an usb stick simply format it clean in fat32 format, put all bios updates on it, 0601,0701,0801 and if u wish 0902 and boot. Go into bios , last tab, EZ Flash and click it. After it loads simply select your flash usb if it isn't selcted and click first update 0601, wait it to load, reboot and repeat. That's how i updated to 0801.

Repeat: updating the bios won't fix it.

Try1: Powe on by PCI-E
Try2: disable PLL overvoltage ( this works 100% )
post #8 of 15
Quote:
Originally Posted by TerrabyteX View Post

Repeat: updating the bios won't fix it.

Try1: Powe on by PCI-E
Try2: disable PLL overvoltage ( this works 100% )
I did try the power on by PCI-E option in the BIOS, this fix worked for the p67 motherboards, didn't seem to work with the z68 platform.

I'll try the PLL Overvoltage later this evening and see what happens.
post #9 of 15
ok do that fixed mine and all of the system i built on asus mobos.
post #10 of 15
Thread Starter 
Flashing to 902 has fixed the issue as far as I can tell, though unfortunately the BIOS is reading CPU temps 10 degrees lower than what they actually are so I had to screw with fan profiles in Fan X-pert to try and get my temps back to normal again. Not a good thing when you're air cooling in Australia during summer.

EDIT: Ah, nice to see that my computer can now wake up after going to sleep. Nice.
Edited by MercurySteam - 11/9/11 at 3:08am
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