PC not starting up with new PSU, PC still works with old PSU and the new PSU works in other PC.

Runelink2

Prominent
Jun 6, 2017
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510
I got a new Corsair RM850X and the PC doesn't start after installing it. The PC still works fine with the old PSU so the board is fine. I also tried using the PSU in another machine and it works fine in that machine so it looks like the PSU is also fine. Is it possible that the PSU isn't compatible with the board?

The light on the GPU does come on and the "Audio boost" light comes on on the motherboard but nothing happens when I try to start it.

These are my full specs:
MSI GTX 1070 OC
i7 4770k
msi gaming g45 z87 board
500gb ssd
1tb HDD
Old PSU: OCZ OCZ600MXSP

Thank you.

PS I have done this checklist: http://www.tomshardware.co.uk/forum/261145-31-perform-steps-posting-post-boot-video-problems
 
Solution
As that PSU is new directly contact Corsair as what you are having is a rare case of incompatibility. Corsair has great customer support system and they will surely help you through.