echo_three

Seem to be the case. I have just submitted an RMA request so we shall see how that goes. Appreciate your replies and time ready all these walls of text.

So i swapped pair 1 into the other slots (they were in the slots labeled 'First'), booted fine, bios and windows, swapped to pair 2 just to check and again booted into bios and windows fine. Installed both pairs, no boot, no bios just hangs on Dram LED. Try a few reboots, all the same, left it for around 10 minutes just to see and no change, powered off and plugged from the wall a few times to see if anything and nope, just the same. Swapped the pairs around pair 1 into slot 1, pair two into slot 2 and vice versa, no difference. So i removed Pair 2, as these were in slot two at the time and left just Pair 1 on Slots 1. No boot, same thing as when both pairs were installed. tried both slots 1/2 and tried powering on and off a few times to see what happens and just hangs on Dram LED. Swapped back to pair 2, slots 1. booted first time no issues, tried the other slots and same, booted fine, bios etc no issues. Go back to pair 1, no boot, hangs on Dram LED. Swap back to pair 2. Working fine. Once again this is all on default settings and not changing anything. The main issues I have here are that I'm outside of my 30 days return policy with the store. They have that I would need to send the Ram back to them let them test it, and then if faulty send it back to Corsair for an RMA. With one set of Ram seemingly working fine, should I just send back the one set? Apologies for the walls of text but I wanted to make sure that I didn't miss anything. Thanks for any and all help.

Update as of this morning. For ease Pair 1 is the currently not working, Pair 2 was working all last night whilst playing the Witcher. So after running for a few hours last night with pair 2 and all being well I thought this morning that I would again try swapping the ram over. First I set all setting to default within Bios and then rebooted a few times to make sure that pair 2 was fine. All seemed ok. Swapped to pair 1, Dram LED. Not working. Tried both slots with the pair of ram and nothing. Went back to pair 2, took about 90 seconds to boot, but it worked, rebooted a few times, seems ok, swapped pair 2 to the other slots and again, posted, bios, windows, all ok. So i went back to pair 1, nothing, tried a few restarts and always hangs on Dram LED. Went back to pair 2. booted fine, went into Bios, re-flashed Bios. Same Bios, no update or anything, just a reflash. As I can access Bios I'm re-flashing within Bios, after getting to 100% it then restarts. Cept it hangs on Dram LED for about 90 seconds before moving onto GPU LED. No boot, no bios. Restarted, hangs on the Dram LED and then Boots into Bios, then into windows. Several restarts to check, all seem fine, straight into windows. Tried a few times with taking the power lead out as well and all good. So, back to Ram pair 1. No boot, no bios just Dram LED. Powered off and restarted, went from Dram LED to GPU LED, restarted and got to Bios splash screen and it froze. Restart, get straight into Windows. Powered off and on and back into Windows. Seems Ok. I'm writing this with the system power up and working. For now. All during this time Bios has been set to default settings and nothing changed. Now I'm going to swap pair 1, which seems to be running and ok to the other slots, if that works I'm going to try again with all 4.

Thanks for the reply. Not that it means anything buy the serial numbers on the ram run consecutively ends in 998, 999, 000, 001. Yes my boards supports flashback/re-flashing etc with whatever bios you want to put on. I can post now with either: 1 stick, any of the 4 modules in any of the 4 slots, 2 sticks, either of the two kits in either channel (a1+b1 or a2+b2) I cannot post with all 4 sticks as it just sits on the Dram Post LED. All of this is with no changes made to Bios and everything at default. Default memory speed is 2133mhz. Currently I have two sticks in and I can enable XMP and it gives me the right speed (memory clock set to 1800). I will try to re-flash the Bios again and see what happens. On previous systems I haven't really bothered with updating the Bios however with this being a new launch of CPU and Boards I wanted to make sure to keep it up to date, especially with the issues of the Ryzen 3000 series (Poor boost performance and idle voltage). Working through your list you mentioned: 01) I have the most recent Bios loaded on a stick 02) Once I initially updated the Bios (this is the second time updating it, once when new in which I had exactly the same Dram Post LED, and once more after Gigabyte releasing an update) I tried clearing Cmos. 03) Everything is set to default within Bios 04) Now it posts fine with 2x sticks on Auto 05) Don't think I can go lower than default 2400mhz 06) Ran 4x passes on memtest86 around 7-8 hours with no errors before updating the Bios. This was when I had all 4 sticks installed and it was posting although I was getting the random reboots with no BSOD 07) This is where I'm up too, going to re-flash the Bios now and see what happens. I have a feeling that once I have flashing the Bios, it will not boot with any of the Corsair memory and I will have to put in my daughters ram again to finalise it/get it to post but we will see. As a side note, running last night with 2x sticks of Ram I was palying wither 3 for around 5 hours without a reboot or any other issues. Only Bios setting that was enable/changed was that XMP was enabled.

So after running a 3570k for 7 years or so I finally upgraded to an AMD 3700x, Gigabyte x570 Ultra, replaced my 7 year old H100 with an H150i and replaced my Corsair LP DDr3 Ram with some nice and RGBy Vengence Pro 3600Mhz (4x 8GB). Replaced the drives too. Ram serial is CMW16GX4M2C3600C18W. 2X 8gb sticks and bought 2 lots. I carried on using my trusty AX850 and a few fans from my old system. Built everything up just over a month ago and had no initial issue (although had only just built it so time was spent downloading updated and stuff). Two days later I updated the Bios as I was keen to get the new fan profiles for the mobo fan and generally newer Bios. After running the Gigabyte Bios updater (within windows) the pc was meant to restart, finishing the Bios update and then launch you into Bios with default settings. However, this is where the issues started. It didn't restart, it just turned off and I had a constant Dram LED on the mobo and wouldn't boot. I started off just reting to restart it a few times and got nothing, tried dropping 2 ram sticks, tried using just one, tried each stick in each ram slot. Nothing would get it past the Dram LED. I ended up stealing 2x 4gb DDr4 sticks out of my daughters Ryzen build. Booted first time, got the Bios finishing update screen, then posted straight into Bios. Left everything at default and posted to windows. After this i put my original Ram back into the machine and it booted into Bios, then on into Windows. After installing the newer x570 chipset everything seemed to be ok. This is apart from the machine restarting. No BSoD, no crash report, windows event viewer states that machine shutdown "The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly." Now this might happen after 7 hours or after three, a couple of nights it hasn't happened at all. Most night it happens 2-3 times. This morning I decided to update to the newest Bios released a few days ago. Same thing where it wouldn't post straight after. Dram LED constant. Pulled Ram, tried each stick, in each slot, nothing. Stole my daughters Ram again, posted first time. Same as last time. Bear in mind that this is with all default settings. So after suing my daughter Ram to finish the Bios update I put 2 stick on my memory back in, Dram LED, tried one, the same, tried each stick in each slot until on my last stick, first ram slot worked, it proceeded to work in each slot and post to Bios, I then tried another stick, and now, it seemed that I could get into Bios each time. after retrying all 4 sticks on their own each was working, so i tried 2 sticks. Then I tried the other two sticks and each pair would work on their own in either of the sets of slots. However if i put them in together it doesn't work and I just get the Dram LED. Also, just a side note, when testing the ram this last time round on single stick it would post to bios straight away, when using either pair of two sticks it would initially on the first post take around 2 minutes to get into Bios. After that its a normaly 15 seconds or so. When plugging into all 4 sticks it just sits in this post loop where the Dram LED is on constantly but flicks to the CPU Led every 30 seconds or so before flicking straight back to Dram LED. While trying to figure out the issues with the reboots I had run prime 95 for around 4 hours, no issues, ran through 4 passes of memtest86 with 0 errors and was looking at the possibility of replacing my PSU. Now I think that theres a fault with my ram, or my board, or something else. The place that I bought all the new parts from have said to send them back the ram, but I worry that they plug it in and it works fine. They said that if this happens I would have send them my full rig and pay to have it looked at. I'm really lost with this, fed up as hell and regretting ever upgrading. Please Help, So I'm a little lost.