Bmcd77

just to finish this post off : As indicated due to discussions on this forum corsair offered a third RMA replacement proactively. I in turn asked for an Ax1200i instead of another hx1200i since as described I could not boot my mobo with the 2nd replacement unit and wanted to try something different 3rd time round. They shipped my hx1200i to California direct and quick couriered me an Ax1200i. I plugged it in to my Asus z270-a and it booted correctly immediately into the bios (unlike the 2 previous new hx1200i's). So it wasn't a problem on my end as I was starting to presume. So conclusion is they've clearly got a batch of dodgy hx1200i's off a production line. When you are alone with you gear your last conclusion is that the new unit is faulty so I lost a fair bit of time fault finding. None the less, the service I received from Corsair was very good and they got me an Ax1200i in the end which solved my problem. They communicated throughout keeping me in the loop so thumbs up to the service. Also a quick well done to whoever asked what the batch number of the hx1200i was. Seems that was a good shout.

Some great service incoming from Corsair. Due to my comments on this forum in help.corsair.com they've got in touch with me to recommend an RMA of the PSU. Thanks to @jonnyguru for the response in here and sensible discussions and Corsair for proactively suggesting a new RMA. #2003681921.

I think perhaps I should open a ticket again. My z270-a will run from a Corsair RM550x PAU so it’s intact and ok. I don’t know why the hx1200i won’t Post the board but I’ve tried everything I can think of. Hoping there isn’t a new revision of the hx1200i that is causing this. thanks for the comments and suggestions thus far . Let me know if you have a strong opinion either way (it’s the mobo / it’s the PSU) Just would like to get my pc running again.

Its an Asus B150-M it's an older board I use for a mini budget server I built several years ago (DDR3, i5 7500, 6 HDD's) following this (https://blog.briancmoses.com/2017/12/diy-nas-econonas-2017.html) The board in my estimation would have lower tollerances that the z270-a which is maybe more refined. My first RMA of the hx1200i following the original failure had a 12v rail that was fluctuating down to 11.3v. I booted the B150-M with it and got voltage surge warnings and when in the bios the voltage figure I was watching was literally jumping around. I presumed that was why the Z270-a would not boot (I still think a fluctuating 12v rail on a higher end PSU out the box is a fault) My second RMA is the one we are discussing. The rails seem stable (better) but something is off on iether the PSU or the Z270-a. It could be a subtle as a tolerance and I think the B150-M would have lower tollerances being an older more basic board. I presume that's why I can boot that one but not the z270-a.

The Original SN is : 18107137000013900648 not sure which part is the lot code. Part Number : CP-9020070 / 74-010584 The RMA was done by Scan in the Uk I presume. (it was def done in the Uk)

Thanks for the reply. The hx1200i I’m referring to I recently received (RMA) from 2003614893. This RMA was because of an original failure being 2003569782. I’ve not raised another yet due to some disbelief that a third hx1200i could have an issue after the original was solid for 2 yrs but perhaps it could be the case. I always think I’ve missed something first. I’ll consider another ticket if I don’t get any further running my own tests. Is there a PSU tester you can recommend to be absolutely sure? Thanks

Here we go : Sn: 20387191

Hi, I'm trying to get an hx1200i to post an Asus z270-A mobo. I ran these 2 together no prob for 2yrs then the hx1200i went 'bang'. I've RMA'd it and now can't get the Asus z270-A to post. However I can get the mobo to post with a spare Corsair Rm550x and I can get the hx1200i to post a different board too. I've stripped the z270-a down to bare components. The led power light comes on and the cpu fan spins but no post. Bizarre given both post other systems ok. I booted the z270-a into win 10 and left it for 24hrs with the 550 psu but the hx1200i won't Post it. Any suggestions?