Question Boot/Post issues after installing new Seasonic Titanium PSU

jdj9

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Jun 26, 2015
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Hello everyone.

I have been experiencing a strange issue lately and any help will be appreciated greatly.

Specs:
  • Mobo: Asus Maximus VII Ranger (latest bios - not beta)
  • CPU: 4790k - stock speeds
  • Ram: 2 x 8 gigs 2400 Dominators - stock speeds
  • SSD: Samsung Pro
  • HDD: 2x7200 rpm
  • GPU: MSI GTX 1080 Ti - stock speeds
  • CPU Cooler: H110i GT (240mm)
  • Fans: 3 intake front (120mm), 1 exhaust rear (140mm), 2 radiator fans (140mm)
  • PSU: Seasonic Prime 80 Plus Titanium 850w
As per an online calculator i found, my system should draw around 650w.

I was using an old Cooler Master 1000w (which still works fine) and i wanted to invest in a more power saving good quality PSU.

I purchased a new Aerocool Project 7 Platinum 850w, which i returned after a couple of weeks because of the issue i will explain, and i replaced it with a new Seasonic (but does the same behavior). I doubt that the issue will be the PSU's (both?!).

So upon installation everything was OK no issues at all. After a few days of use, when i powered up the PC, it shut down after a few seconds, and then booted up again by itself but there was no post/no image of the bios. It was just powered on with the fans and Hdd's spinning.

Either it would just shut down and boot up with no post, or just power up with no post.

The only way to make it post, is if i reset the bios (reset bios button) to make everything go back to default. Then it would post.

After resetting the bios, i changed to the below settings (which were my settings before even changing the PSU):
  • Setting the XMP profile for the ram
  • Changing the chassis fans to behave according to mobo temperature
  • Changing the UEFI boot settings
I never OC'ed.

I have tried:
  • replacing Ram
  • replacing PSU power cable
  • tried different power outlet
  • removed everything from mobo and left only GPU, Ram, CPU (also removed chassis fans and cpu cooler)
  • tried a different GPU
  • Stress test with Aida, Prime (once i booted into Win)
Today, i had to reset the bios twice to make it boot properly. The first time i reset, it successfully booted but would not post after shut down. After the second reset, it would post normally and after multiple shut-downs/boots.

I don't believe that both PSU's where defective, i think it must be something with the mobo. But i did not have any of these or even similar issues prior to changing the PSU.

This does not happen every day. It happened a few days ago only once with the Seasonic (it rebooted and posted without needing to reset bios), and today which i had to reset twice. Totally random.

Also, forgot to mention that during boot, the fans spin really fast for 2-3 seconds and then slow down, which is normal. Could this draw more than 850w and make the system shut down? No right?

Any ideas?

Thanks.
J.

EDIT: After posting this, i shut down, booted up without issues.
 
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jdj9

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Jun 26, 2015
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Thanks for your reply, i will try this today.

Updating on the issue: i powered it up today, it shut down and rebooted twice by itself, and stayed on without posting. Yesterday i shut down and rebooted multiple times without issue (after resetting the bios twice).
 
Last edited:

jdj9

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Jun 26, 2015
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Tried memtest, everything was ok, besides i also tried different sets of ram, but problem persists.

I tried different ram slots, same. Tried with 1 stick on each slot, same....

=/
 

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