New Motherboard + CPU, showing 55, going on/off

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   Hi all,

Relatively new builder here so there may be something relatively simple I missed. My build is here:

i7-9700k (new)
Corsair Vengeance LPX DDR4 3200 MHz 2x8 GB (new)
Z390 Taichi (new)
GTX 1080 FTW
Corsair AX860 Power Supply

When I boot up I see 55 on the motherboard and the computer turns on and off every ~10 seconds. I've tried resetting the CMOS, going to single channel RAM, varying the position of the RAM, trying a different type of RAM (3000 MHz instead), and returning the motherboard to get another of the same type. Is there something obvious I'm missing or could the problem be a defective CPU?

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Heron155 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 11 Jul 2019 Status: Offline Points: 5	Post Options Post Reply Quote Heron155 Report Post Thanks(0) Quote Reply Topic: New Motherboard + CPU, showing 55, going on/off Posted: 11 Jul 2019 at 1:57pm
	Hi all, Relatively new builder here so there may be something relatively simple I missed. My build is here: i7-9700k (new) Corsair Vengeance LPX DDR4 3200 MHz 2x8 GB (new) Z390 Taichi (new) GTX 1080 FTW Corsair AX860 Power Supply When I boot up I see 55 on the motherboard and the computer turns on and off every ~10 seconds. I've tried resetting the CMOS, going to single channel RAM, varying the position of the RAM, trying a different type of RAM (3000 MHz instead), and returning the motherboard to get another of the same type. Is there something obvious I'm missing or could the problem be a defective CPU?

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 27803	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 11 Jul 2019 at 2:11pm
	55 is no RAM detected. This could be one of 2 things: 1. The RAM is not compatible 2. The RAM controller (IMC) on the CPU is not working for some reason, dead CPU, dirt on contact pads, bent pins in motherboard socket, uneven mounting pressure. Given you have tried 2 boards and another kit of RAM I would suspect the CPU. Check the underside of the CPU for any damage, thermal paste/debris etc and also check the socket for any bent pins. If both CPU and socket check out, RMA the CPU. There was a time when a dead CPU was exceedingly rare but sadly this is not so today. In my experience, code 55 happens most often when the CPU IMC is dead, often at random after a system has been running fine but sometimes even out of the box. Good luck and let us know how it goes.


Heron155 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 11 Jul 2019 Status: Offline Points: 5	Post Options Post Reply Quote Heron155 Report Post Thanks(0) Quote Reply Posted: 11 Jul 2019 at 2:31pm
	I really appreciate the fast response. I'm going to return the CPU and try again with a new one. I've checked for bent pints several times and the underside looks fine.

Heron155 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 11 Jul 2019 Status: Offline Points: 5	Post Options Post Reply Quote Heron155 Report Post Thanks(0) Quote Reply Posted: 11 Jul 2019 at 2:42pm
	Followup, I noticed on this new motherboard there are the 8 pins for power to the CPU then another 4 next to it. I was using an i5 in my old motherboard which only required the 8, should I be using all 12 for i7?

RLGL Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 29 Jul 2018 Location: MN Status: Offline Points: 2025	Post Options Post Reply Quote RLGL Report Post Thanks(0) Quote Reply Posted: 11 Jul 2019 at 9:50pm
	Yes
	Asrock Z370 Gaming K6,Intel i7 8700K, Asrock x570 Taichi