Cosair RM550

JanM · 14 Jun 2016 at 14:33

Hi guys.

Got a bit of an issue with my pc.
I suspect it might be the power supply.

Basically when I power up from a cold start the pc starts to turn on for a second then power cuts out and after another second or so it boots up normally.

Its been happening for a month or so. I've taken the pc apart and put back together again twice to make sure i've not put something togther wrong but it just keeps doing it.

I've plugged just about everything to rule things like fans and hard disks out but they are OK.

Any ideas?

dacads · 14 Jun 2016 at 22:41

Can you list full specs please including age

JanM · 15 Jun 2016 at 09:40

The system is a few years old now.

The psu was replaced 2 years ago abouts.

The system is

Asus z87 sabertooth
Intel 4700K
Cosair H80
Two large fans.
Hauppage wintv 5000
Nvidia 970
Creative ZxR with daughter board.
2 hard disks
1 DVD drive
thermaltake Level 10 Pc case
NEC spectaview monitor
Wacom Cintiq 21UX
Wacom tablet for mouse

JanM · 23 Jun 2016 at 11:24

Any ideas guys? i've just tested the system with a different gpu too and its still doing it.

davewllms · 25 Jun 2016 at 10:07

Does sound like a PSU issue, at this point I would test a different PSU if possible?

JanM · 26 Jun 2016 at 11:25

I'll have to try and get hold of one.

Has anyone heard of a bad motherboard that does this?

pastymuncher · 26 Jun 2016 at 13:45

I have had several Asus boards that do this. In fact my current one is the first that hasn't although I am sure that it used to when I first got it. Press the power button and everything starts for a split second then restarts properly but only when overclocked. If running at stock none of them ever did it. It's as if the board starts then detects it's overclocked and restarts to apply the overclock.

JanM · 26 Jun 2016 at 15:02

Ah not thought of that.
Maybe its a setting issue in the mobo somewhere.
I'll get the manual out and try that the next few days when I get time.

JanM · 27 Jun 2016 at 21:02

So its definitely not a motherboard setting.
Spent an hour today to make sure I have nothing but basic settings and still doing it.
Still trying to get hold of a second power supply to try.

Kei · 28 Jun 2016 at 19:32

AFAIK, it's normal from a proper cold boot. i.e mains was either switched off or unplugged prior to bootup. I was told it was memory training, my asus P9X79 does it too. If I shutdown but leave the mains to my pc switched on all the time it doesn't do it.

JanM · 7 Aug 2016 at 19:49

HI guys,

Just to update its not the psu.

Today I fitted a AX760 and also a cosair h80 to replace the H50 and its still happening.

So there is a fault somewhere else.

Kurgen · 8 Aug 2016 at 16:27

not that it helps you, but my pc will do the same thing when ive either tampered with the overclock..

have you tried gradually removing peripheral items , fans , gpu etc.. or get it down to the bare minimum it will boot with