PC wont boot standing. Sabertooth 990fx / FX8350

AznETick

Honorable
Sep 4, 2013
6
0
10,510
So I had some issues with my setup (BSOD, random shutdowns) and I figured it was either GPU or PSU based on other threads and the fact that I had a 650 bronze PSU from Corsairs that was getting past the 5 year mark.

The old setup wouldn't boot standing up and I thought it might just be the old PSU, since it's boot mighty fine lying down and all.

Well I popped in a new PSU today (Corsair 750x), cleaned my CPU, reseated, new TIM and even gave my GPU a new slap of TIM too which was a good thing since it had dried up and let go!

But alas, as you may have figured, there's a twist to the tale. The b***h still refuses to get into Windows! First attempt got me to Win10 startscreen before powering off and now I get a few red Ledsham and not even past the bios boot screen before it powers off... Unless it's lying down.

The last LED to flash red is the CPU one.


Setup is:
Sabertooth 990FX R2
FX-8350
XFX R9 290 DDR
8GB Corsair Vengeance 1600mhz
Corsair H90 AIO cooler
Corsair 750x 80gold plus

I've gone over the power connectors, fan connections and reseated everything atleast once. Please help.
 


I have, tried all three which didn't do much. I am a bit worried about the 55C idle temps on the card but I find it unlikely to be the cause of the shutdowns.

I've gotten it to run standing, which is improvement, however it shut off out of the blue (again) which was the reason I had to lie it down in the flirst place. What did the job was fiddling with the CPU wires from my H90... Stresstest didn't lead to shutdowns but I'm wondering if maybe the cooler isn't perfectly touching. Maybe the foam on the backplate has lost some strenght by now, I know the adhesive is gone.
 


It could but I haven't a clue how to check without ordering a new cooler... Just bought the new PSU so the budget can't bear a purchase like that.