This PSU is a split rail design so the maker of the PC has more work and research to do over the single rail PSU. Some folk that build PCs only learn about rails when it fails oddly.
I'd try a single rail PSU next because the replacement PSU did seem to cure it, even if for a short time. I'd also add 100 or more Watts to the PSU rating.
Well I'm having trouble with my pc again and I don't even know where to start looking for a solution so I came here to ask for help.
I built my own pc last February with the following parts:
Windows 8.1 Professional (x64)
Gigabyte B85m-HD3 then replaced with Asus B85M-E Motherboard
Intel core i5 4440
Corsair XMS3 Ram (1600) 2 x 4GB
Radeon HD 7850 XFX DD Black Edition
OCZ ModXStream-Pro 600W PSU
Sandisk ultra plus ssd 128GB
When I first built that pc it worked great for a little while but then when I went to turn it on it would struggle to power up and I have a led fan at the front so I can see when it's trying to power up. It comes on for 1 second then off for 1 second then back on for 1 second and keeps going like that until it eventually starts properly which is usually between 2 & 10 minutes normally and everything seems to work great once it's up & running.
I though it was maybe the power supply so I asked for a replacement and it didn't really help and the problem came back after a few days. So after testing a few things I thought it had to be the motherboard so I replaced it with the Asus B85-E and then everything was running fine for 7 months until now and it's happening again.
It's very frustrating and a bit worrying because I don't want any of my parts to get damaged from the constant power loss & restart cycle.
Has anyone got any ideas about how to get to the bottom of this please?