No POST on Crosshair VI Hero with Corsair Vengeance

sdvf

Reputable
Aug 15, 2015
43
0
4,530
Hi Tom's Hardware Community,

I'm in the process of building a computer (https://uk.pcpartpicker.com/list/DkQzxY) for my Step-Dad, he wanted to buy a pre-built one but I advised him that for the price range he was looking at, he would be better off having me build one.

The Crosshair VI's Q-Code LED's (below the main display) help by indicating failures for DRAM, CPU, VGA and BOOT. My DRAM one is lit up. The post code is 'Ad'.

It isn't posting, there is no visual output on the display and I can't get into the BIOS.

My memory (Corsair Vengeance LPX DDR4-2400) is on the QVL list (CMK16GX4M2A2400C16) but not the exact version (I have Ver5.29).

I've moved each DIMM individually into each slot, each time I try to POST the DRAM error indicator still lights up.
When I try to boot with no RAM the indicator still lights up but the POST code is '4B' (which is to do with RAM) and the light still remains on (although I suspect that is due to the lack of RAM)

I have no other motherboard to try and no other DDR4 I can use to troubleshoot the problem.
I have no reason to suspect any fault with the CPU as the LED indicating that the CPU is 'ready to boot' is green and the LED next to that of the DRAM one isn't lit.
I have swapped the GPU for a GT610 (so that the GTX 1070 isn't what is failing to output a signal. Additionally, booting with no GPU yields the same results.) and I've changed the HDMI cable and monitor to ensure that they aren't at fault.
Still nothing.

I could try swapping the PSU from my PC but as I have an LGA1150 system the Motherboard and RAM can't be used as it is DDR3.

If anyone has any troubleshooting steps I could try that would be greatly appreciated.

Thanks,
Sam

Ps. I was going to build the PC on Friday however half way through the build I was going to install the CPU Cooler but stupidly forgot to get AM4 mounting hardware for it. I tried to post it very quickly without a cooler to ensure everything was working but that failed. I presumed it was due to the lack of a cooler and that it was a safety mechanism not to boot but I did not investigate it further. I presume that the memory was at fault then aswell.


 
Solution
The issue is most likely to do with your ram being incompatible or that the BIOS isn't playing nice with them. I suspect it to be the latter. You can't POST but I see that your board supports BIOS flashback which means you can update your BIOS with only a pen drive. Refer to your manual, section 2.2 page 2-13.

Lutfij

Titan
Moderator
The issue is most likely to do with your ram being incompatible or that the BIOS isn't playing nice with them. I suspect it to be the latter. You can't POST but I see that your board supports BIOS flashback which means you can update your BIOS with only a pen drive. Refer to your manual, section 2.2 page 2-13.
 
Solution

sdvf

Reputable
Aug 15, 2015
43
0
4,530


Thanks for your quick reply Lutfij. When I loaded the BIOS onto a USB, inserted it, turned the PSU on and off again and pressed the flashback button it didn't begin to flash as the manual stated it should. Could this be a sign that there is a problem with the motherboard?
 


It could be that the board already has newest BIOS. Check the last 4 digits on motherboard sticker to find out what version it has.
 

sdvf

Reputable
Aug 15, 2015
43
0
4,530


If you mean the four digits in the bottom right, they are 0863, if that is a BIOS version then it is outdated. I tried to do a BIOS Flashback but there was no response with the buttons LEDs or a visual prompt on screen.