Question Problems with Ryzen 3950x build, please help!

[Thefilmbaker]

Having difficulties getting my 3950x build to post. I got it to post and boot for one day and I had windows installed, but when I came back to it that night there was a blinking underscore on the screen and wouldn’t boot at all after that. I swapped out the mother board and still no luck. I’ve breadboarded the build with one memory stick. When I power it on l, the DRAM error led goes on for about 5 seconds and then switches to VGA led and stays on that. I swapped out the GPU and that led is still on. I also tried to reseat the cpu but that didn’t work either.


CPU - Ryzen 3950x
GPU - EVGA RTX 2080 XC Ultra
PSU - Corsair RM750
MOBO - x570 Aorus Ultra
RAM - Corsair 4 x 16gb Vengeance LPX

 

[Thefilmbaker]

Swapping out the CPU seemed to solve everything. Thank you to the incredible folks at Micro Center for their incomparable customer service.

 

[Thefilmbaker]

I'm guessing you jumped the CMOS? if not start there also as others have said, check your memory is seated properly, you'll be surprised how firm you have to push down...I'm sure you already know this but push down on the memory until the little retaining clips on each end of the slot snap into place, if not then it's not seated properly and you could have got lucky the first time around and made a brief connection same with graphics card. also try another HDMI or display port cable, rearranged my setup last night and the monitor wouldn't come on and it was the display post cable that was at fault. Did you set the XMP memory setting in the bios, that thing has screwed me so many times and it wont boot, uncheck this if you did.
If you can post to bios ( i'm guessing you can't) check the boot order of your storage devices. If you installed windows using a thumb drive then remove it and try again without it, I've had a problem there once before.

Again this is obvious but check the cpu fan header and that you have it plugged into the right header on the mobo, I messed this one up last week when I installed my new Ryzen 3900x, I put the fan cable into the water block pump header on the mobo by mistake, is your cpu fan even spinning or water pump working?. Another obvious one, did you try the cmos reset? if so was it via a button on the mobo or did you have to jump the pins on the mobo and forgot to move them back or missed and went too far and only one pin is now jumped.
Also, as someone else said, is your memory in the correct slot? you would think that the slot closest to the cpu would be the correct one but on my board it's the second one in (slot 2) and slot 4 to use 2 sticks for dual channel.

That's about all I can think of right now.

Thanks so much for taking the time and trying to help! Swapping out the CPU seemed to solve everything.

 

[jon96789]

couple of questions...
What CPU cooler are you using?
What is the speed of your RAM?