Boot up stall, Q_error 15, CPU led red, no display

Nikli · Sep 7, 2014

Hi community,

I've got an Asus Maximus VII ranger, custom build. When I got my rig, it seemed to intermittently stop during boot up, and not even far enough to get a display signal.

It always hangs at Q_error 15 and I've just noticed the Q LED for cpu error is red.

I managed with a few off and ons to boot the PC, put windows on and even run Battlefield 4. Then after leaving it overnight, refused to boot again. A few more times on and off and I got it back up, updated the BIOS as a precaution and then again after a while being off overnight, it refuses to boot.

Bizarre that it did work perfectly and now wont.

I've got an Intel Core i7 4790K
2x Corsair 8GB PC3-12800 1600MHz DDR3 Vengance with XMP
Corsair Hydro Series H100i Extreme performance CPU cooler
Corsair 850W RM850 gold PSU
XFX R7900 graphics

I took it back to the guys that put my rig together, they said it worked fine on a cold boot, and changed a BIOS setting for the RAM i think, which apparently wasnt default on the stock bios or on latest bios version... apparently that fixed it.
I brought it back home, PC hung once or twice, third time booted fine and was again away on BF4.
Next morning, stops at the same error point.

So frustrating!!!

Any help is most appreciated

p.s. I've tried multiple power cables, displays, all the same problem.

volcanoscout · Sep 7, 2014

The three most likely culprits for this problem are your DRAM, your CPU, or your mobo (bent or broken pins in CPU dock, or could be faulty DIMM slots).

Try pulling one of your DRAM sticks and install a single stick in slot A2 (second slot from your CPU). Make sure the connection is clean (try wiping the contacts on the stick with isopropyl alcohol and a coffee filter or lint-free cloth), and that the card is fully seated and locks engaged. If error repeats, try the other stick in the same slot. If the error is still there, try single sticks in the other slots.

If the error is still occurring, the next step would be to check the CPU dock for bent or broken pins and that the CPU cooler is mounted correctly, but since you had it assembled I would take it back to the shop and make them do it. Was this done at an actual business or just some guys you know? Bad CPUs are pretty rare but it's possible. Faulty mobos are more common, in which case you can just RMA the board. If it's a fault caused by improper installation, you should be covered by the shop's warranty. If you get it back from the shop and the system still experiences the error, I would demand a refund, then order the parts yourself and we'll help you put it together right.

Nikli · Jan 10, 2015

volcanoscout :

The three most likely culprits for this problem are your DRAM, your CPU, or your mobo (bent or broken pins in CPU dock, or could be faulty DIMM slots).

Try pulling one of your DRAM sticks and install a single stick in slot A2 (second slot from your CPU). Make sure the connection is clean (try wiping the contacts on the stick with isopropyl alcohol and a coffee filter or lint-free cloth), and that the card is fully seated and locks engaged. If error repeats, try the other stick in the same slot. If the error is still there, try single sticks in the other slots.

If the error is still occurring, the next step would be to check the CPU dock for bent or broken pins and that the CPU cooler is mounted correctly, but since you had it assembled I would take it back to the shop and make them do it. Was this done at an actual business or just some guys you know? Bad CPUs are pretty rare but it's possible. Faulty mobos are more common, in which case you can just RMA the board. If it's a fault caused by improper installation, you should be covered by the shop's warranty. If you get it back from the shop and the system still experiences the error, I would demand a refund, then order the parts yourself and we'll help you put it together right.

New motherboard fucked up.
Then replacement failed too.
Statistical chances of that??? <0.0005 for sure.
Crazy.
ALl good now

volcanoscout · Jan 10, 2015

That truly sucks. Third board was a charm?

Nikli · Jan 10, 2015

volcanoscout :

Yep it was... unbelievable!!!

Didn't figure it out till we tested/changed everything... RAM, vidcard, cpu, psu etc etc

volcanoscout · Jan 10, 2015

Well, sorry you had to go through that, but I'm glad you got it sorted out in the end. On the bright side, you're probably much more knowledgeable about the inner workings of your computer than you were before

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Boot up stall, Q_error 15, CPU led red, no display

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