PC not booting!! PSU??

[GTXNEXUS]

Hey guys

I run into some problems powering up my PC after adding a radiator and merely 4 fans. Not sure if it's my PSU or something else. I am using a Coolermaster V1200 with the specs shown below in the screenshot attached (I used the wattage calculator. Hopefully that make it easier to see what I am running in the rig).

All the fans are connected through molex directly to the PSU. The weird thing is that I can turn it on if I unplug all or some of the fans. Obviously if I plug the fans in after turning on the rig everything is working fine. If I connect everything and try power it on the light will blink once and nothing happens as if there is not enough juice to power them up. I also tried splitting the fans into 2 or 3 different power cords connecting different sockets on the PSU with no luck. Please shed me some light on what's happening, thanks...

 

[BottleGamer]

Please tell us the Wattage of the PSU you have and what model.
Have you tried connecting the fans to the mother board ?
And just to be sure: Do you have 21 Fans in your system ?

 

[GTXNEXUS]

Please tell us the Wattage of the PSU you have and what model.
Have you tried connecting the fans to the mother board ?
And just to be sure: Do you have 21 Fans in your system ?

Hi there, sorry I should have provided more details. I did mention that I am using the Coolermaster V1200 PSU. That's 1200 watt and platinum certified. And yes 21 fans, 18 on 4 radiators and 3 case fans. And that's why I would't connect them to the mobo but does it matter though?? Thanks...

 

[BottleGamer]

Please tell us the Wattage of the PSU you have and what model.
Have you tried connecting the fans to the mother board ?
And just to be sure: Do you have 21 Fans in your system ?

Hi there, sorry I should have provided more details. I did mention that I am using the Coolermaster V1200 PSU. That's 1200 watt and platinum certified. And yes 21 fans, 18 on 4 radiators and 3 case fans. And that's why I would't connect them to the mobo but does it matter though?? Thanks...

Have you already tried to find out with how many fans the systems boots ?
and how many molex adapters do you use for the fans ?
Also please name the fans if you can

 

[GTXNEXUS]

Please tell us the Wattage of the PSU you have and what model.
Have you tried connecting the fans to the mother board ?
And just to be sure: Do you have 21 Fans in your system ?

Hi there, sorry I should have provided more details. I did mention that I am using the Coolermaster V1200 PSU. That's 1200 watt and platinum certified. And yes 21 fans, 18 on 4 radiators and 3 case fans. And that's why I would't connect them to the mobo but does it matter though?? Thanks...

Have you already tried to find out with how many fans the systems boots ?
and how many molex adapters do you use for the fans ?
Also please name the fans if you can

So I just tried power off the system and back on without changing anything and it's working fine this time. Then I tried power it off for 10 minutes and back on and it still worked fine. But this morning when I tried turning it on after being shut off for 8 hours or so it won't do anything unless I disconnect some fans. So that's pretty weird since 1200w PSU should handle all these fine not to mention that fans don't need a lot of power not like adding another GPU right? I know little about PSUs but it seems that it needs to be "warm up" to do some heavy lifting? Is "cold start" even a thing??

Anyway back to the fans, I've got 8 EK Vardar 120 F4s, 10 Corsair sp120 led fans and 3 Phanteks 140mm case fans. A Y-cable is used to connect all corsair fans and then a 12v to 7v adapter on the molex. 3 Phanteks on another Y-cable to another 9v adapter on molex. Every 4 EK fans use one splitter and a molex to supply power. So in short 4 molex connectors in total in 2 different power cords directly from the PSUs with nothing else sharing power. (I even try splitting them in 3 separate cables with no luck)

I want to emphasize that I can replicate the "cold start"-not-working situation since it happen a few times already. (Forgive me for not using a proper terminology for that cause I really don't know). I just don't know how long it takes to enter that "mode". I might try to find out how many fans I can get it to boot with but it might take me some time.

Any clues on what might be the issue here with all these information so far? Sorry for the essay, thanks...

 

[RaduV93]

I had a similar problem with the fans on my Corsair 400R.The psu was shutting down when I tried to boot with the led's on the fans turned on. I'm guessing that there are too many fans on a particular rail

 

[GTXNEXUS]

Just tried powering it on after being shut off for a day(20+ hours) with the fans disconnected and it booted fine. So it is not likely a cold boot issue. I will test later doing the same thing but with the fans connected and see what happen. If it doesn't boot then it's most likely the fans that's causing the problem. But if it still boot fine then I really don't know exactly what was the cause. Will report back, thanks...