PC only boots once after reset power supply, new Zotac GTX 970 [SOLVED!]

elthionel · May 6, 2015

Long time PC builder here, done all the checklists and narrowed my problem down -- but I don't know exactly what to do next.

Long time, experienced PC builder here. I'm at my wits end.

- Bought a new Zotac GTX 970, inserted it into the PCI x16 3.0 slot. Two 6 slot power leads.
- CPU is a i5 4670k.
- Motherboard is Gigabyte Z87x UD3H.
- Powersupply is a OCZ GXS600 (600watts).
- Previous video card was an Asus 7850.

Previous build was rock-solid stable. I don't overclock.

So when the GTX 970 is inserted, it will boot once. If I soft reset/restart in BIOS or Windows 7 I can keep the PC on indefinitely. BUT if I shut down the PC, I can't get it to boot again.

Symptoms:
- Pushing power button results in no activity.
- If I turn power supply off/on, and push power, there is a brief flicker of power on the motherboard and fans, and then it stops. Motherboard light remains lit on to denote power.
- If I turn power supply off, pop the CMOS battery, wait 20 minutes, I can get the PC to fully boot once again. Will not boot a second time unless I repeat this step.

This only happens if I have the GTX 970 in the motherboard. Works fine with 7850.

If I fully boot the PC, i can stress test the components and everything works fully.

So my guess at this point is:
- Motherboard isn't recognizing the shutdown state and/or is (falsely?) detecting a power issue and preemptively shutting down.
- Some obscure conflict between the Zotac 970 and Gigabyte motherboard?
- There's a BIOS setting I'm missing

I really don't want to have to do this, but my thinking now is that I will simply have to return the 970 as its beyond my abilities as a hobbyist to resolve. Any other ideas?

PS Other notes: updated BIOS from 6 to 9 to 10b; disabled onboard video.

qazzi · May 6, 2015

just wanna ask did you try removing all HDD/SSD then trying to power up again? my logic on this is.. Zotac 970 recommended power is around 500w so if you have a bunch of HDD/SSD and CD/DVD-ROM, you might have power issues.

bgunner · May 6, 2015

Either it is a PSU issue or the 970 has a compatibility issue with the Gigabyte board. Do you have a spare PSU around or could you borrow one from a friend or family member to test? IF the PSU tests good then you will need to purchase a different brand of the 970. It is not unheard of for GPU's to not be compatible with certain boards for what ever reason.

elthionel · May 6, 2015

qazzi :

Thanks for your advice, unfortunately it didn't work.

I removed my SSD, 3TB drive, and 3 simms of memory to minimize all power draw. Only thing plugged in was the CPU and the video card, same result.

Interestingly, if i leave the power supply disconnected for 20 minutes, the PC will boot (once). I don't have to remove the CMOS battery.

But if i cut power, and remove the CMOS battery, i still need to wait 10-20 minutes. So I'm not sure its the battery, but some conflict in the BIOS that needs to clear....

Bossyfins · May 6, 2015

WHat is the exact model of the PSU? IT may not be haswell compatible.

elthionel · May 6, 2015

Bossyfins :

Power supplies need to be Haswell compatible?

I misspoke earlier, its not a Thermaltake its an OCZ.

OCZGXS600, rated for 600W.

EDIT: This might be it. http://techreport.com/review/24897/the-big-haswell-psu-compatibility-list A new sleep state introduced with Haswells.

bgunner · May 6, 2015

elthionel :

the new sleep state only effects the power draw in sleep mode. IF the PSU is Gen 4 compatible when in sleep mode the power draw is reduced further. This is all that this is.

It really is starting to sound like the PSU is bad. I'm thinking for some reason the one of the PSU's protection circuits is flipping when you try to restart. The time your experiencing is the time it is taking to reset. Like I mentioned before try a different PSU in the system to test it.

Bossyfins · May 6, 2015

Mk III Silencer: PPCMK3S1200, PPCMK3S850, PPCMK3S750
Mk II Silencer: PPCMK2S950, PPCMK2S750, PPCMK2S650
Fatal1ty Gaming Series: OCZ-FTY1000W
ZX Series: OCZ-ZX1250W, OCZ-ZX1000W, OCZ-ZX850W
Z Series (EOL): OCZZ1000M, OCZZ85M

Those are the psus from OCZ that are haswell compatible. So PSU is probably the problem.

This PSU will work.

http://pcpartpicker.com/part/xfx-power-supply-p1650bbefx

YOu can opt down to the 550 watt, but ocing won't be very viable.

bgunner · May 6, 2015

For more info on the haswell PSU issues have a read of this: http://techreport.com/review/24897/the-big-haswell-psu-compatibility-list

elthionel · May 6, 2015

Thanks bgunner and Bossyfins.

Ran to my local computer store, got a Corsair RM750 which is Haswell compatible. Installed it, everything boots fine now.

So it was either a) power draw not being Haswell friendly from the old OCZ PS, b) not enough power from the old OCZ 600W, or c) a dying power supply.

Thanks everyone for your help.

Bossyfins · May 6, 2015

elthionel :

Well. I wouldn't have gotten the RM either as it has some issue here and there, but you shouldn't have to many problems since its capacity isn't near what it outputs.

bgunner · May 6, 2015

Glad you got it going. I recommend running a full suite of stress tests just to put the new PSU under a good load to make sure there will be no more issues.

The Corsair RM series is much better than the Corsair CX series that they put out for those on a budget. The RM should hold up well over time but there are always defective pieces out there.

Good luck

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PC only boots once after reset power supply, new Zotac GTX 970 [SOLVED!]

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elthionel

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