Fidaros

That makes a lot of sense. I was spying on Turnip's case and the date he reports his replacement HX1200i failing, coincides with the sudden drop in temperatures. The UK last week was having a rather warm fall and this week, it started turning on the freeze sort of Tuesday/Wednesday-ish, depending on which part of the UK you are in. If the heating has been turned on in the house, it could have been warm enough until the sudden drop this week which would have changed things. Anyway, I'm glad you got to the root of the problem. I am sorry I couldn't wait for the fix though.

My room is often kept cool. Typically it's always kept between 62-68 fahrenheit. I do remember that with the first HX1200i, there was a indian summer and we were having warm days so it was definitely above those temperatures. The whole of October became very cold and that's definitely when the 2 replacement HX1200is were tried and didn't work at all. Today's cold though, my room was 59 degrees when I fired up my PC. And if you need any more info, feel free to ask. I will jump right in when I see the notifications.

Just wanted to follow up. Firstly thanks to Corsair customer support and jonnyguru here for all your help and support. You guys rock! Regrettably, I took the refund option after 3 HX1200is failed and went with another brand as I was desperate and just picked anything that was available. This PSU arrived 5 days ago and it worked right away and has been happily churning since. I have always had great experiences with Corsair products and this will not deter me from still being a Corsair customer. You tried your best to make things right and I really appreciate it. I will still look to Corsair for all my future needs in coolers, PSUs, memory, etc. I wish you the best and hope you get to the bottom of the HX1200i problems!

You are seeing this same exact problem I had with a MSI motherboard in the USA? Does your HX1200i's serial number start with 203471 or 203871?

I am not an electrician but I am wondering that since all the problems seem to be UK based, is it possibly an issue of the HX1200i and the UK AC voltage/frequency that is having a problem? Do the other Europeans on 230V have any issues? Can you get one of your UK partner retailers to test with a new HX1200i and a motherboard in their inventory?

I did try 2 different BIOS versions, 1302 and 1602. As for the board revision, I can't verify that unfortunately. I did RMA the board which still had the same problem with the HX1200i. 3 HX1200i have failed to work with my board while the RM850x just happily works and wishes I won't trade it out. I need a power supply soon because I've already gotten 2 additional harddisks which I will need to add into the system soon. The 3080/3090 remains elusive but that is definitely in the plans to speed up my ML work.

Mine has a similar lot code but did not work. :(

Have you had any word from the escalations or support? I got a snappy response from support. :(

I forgot to add. This package came from the Almere, Netherlands.

Yes. 2nd and 3rd HX1200i won't start up from the first power up.

The 3rd HX1200i arrived and it still unfortunately does not work. This HX1200i has S/N: 20387191000005840178. I can't keep testing the HX1200i like this. Going to call for a refund now. Thanks Jonnyguru for your help with this, I very much appreciated it. If you need any more information from me, I will still be around to answer your queries on the problems I faced.

Customer support did not tell me a single thing about where it is coming from.

Did anyone of you receive a replacement HX1200i that worked? Mine is being delivered and I should receive it on Thursday or Friday.

You got an advanced RMA and shipping label? I got a regular RMA and had to pay for shipping to return the HX1200i. :(:

Check your DM please.