RE"Hey guys, just finished my new build, specs are
Asus z97 hero
Corsair 2133 vengance pro
custom corsair psu cables
I was having no dramas for a few days but playing bf4 the other day the PC randomly powered off and I got the RED led status light on the psu.. After unplugging all the cables I did several self tests on the psu and got the RED led.. After several attempts I got a green light.. So I plug everything back in and boot up but now at random times the PC randomly turns off and restarts (at first it was during boot it was happening but not it happens during games..). During the restart I get the message "Asus Anti-Surge has been activated...etc". I have tried plugging into the wall directly and resetting defaults in the bios but no luck..
Since the PC overnight though I have had no problems with it and everything seems fine... I'm just worried the PSU could be unreliable..
Anyone have any thoughts or had a similar experience, should I RMA the PSU anyway to be sure?
I had the exact same problem as you.
Asus z87 DeluxeDual
Intel i7 4770k water cooled with corsair H100i.
Sapphire HD7970 6GB OC Vapor-X Primary GPU.
Sapphire R9 280x 3GB OC Tri-X Secondary GPU in Crossfire.
Crucial Ballistic RAM 4x8GB run at 1600MHz.
Corsair psu cables as supplied with the Ax1200i.
Ax1200i, currently run from an APC 1500 Battery Backup PSU.
Case = Corsair Obsidian 800D.
I have been running 3DMark Firestrike tests to validate CPU and Crossfired AMD GPU overclocking.
i had a few BSOD's/Red Screen of Death crashes during my overclocking.
After runing my CPU +GPU Overclocking tests, I started to have some random power downs at first over previous days, but I was always able to immediately reboot the PC.
I was starting to worry that it was a Tantalum Cap Failure starting on my Motherboard. This is a classic sign. If a Tantalum cap starts to leak current it causes the psu to trip. The cap can self heal enough just in time before you power up again.
Then I was running an extreme CPU and GPU Crossfire overclock. I started Firestrike Testing and the system RED Screened, followed by BSOD, then powered off but would not restart at all. The Red trip light was on on my Corsair PSU. Since the PSU had actually tripped I was very worried indeed.
I worked the next day and stripped my system down completely, even removing the H100i and reapplying thermal grease. I checked all of my PSU cables for shorting.
I checked the Motherboard was sitting on stands correctly. I rebuilt everything and it rebooted fine I used the system for 10 minutes and then the system tripped out and would not reboot.
The PSU sits at the rear biottom of the Corsair 800D case. 3 of 4 screws are used to attech the PSU to the rear of the case.
The bottom of the Ax1200i PSU sits just above 2 thin metal strips on the bottom of the Corsair 800D case.
What i found is this.
(1). If I leave the PSU fitted as standard then eventually my System will trip out. The Red LED on the AX1200i PSU turns on. Alternatively the system will go into multiple reboot attempts which all fail, seeming to trip out on Motherboard CPU led.
(2). If I try to reboot the system from Power off it gets as far as the CPU LED flashing briefly on the Motherboard and then the AX1200i PSU trips out (Red LED on). Alternatively the system will go into multiple reboot attempts which all fail, seeming to trip out on Motherboard CPU led
(3). During Multiple Reboot attempt (CPU LED flashing briefly on the Motherboard). I touched the PC case gently and held it there. The system always boots up after 2 or 3 reboot attempts.
(4). If i lift the front of the Corsair PSU box up slightly, increasing the physical distance between the Bottom of the AX1200i case and the thin metal strips at the bottom of the 800D case.
I then attempt to reboot the system it powers up fine.
I think there is an RF earth loop / Grounding issue.
Two thin metal strips at the bottom of the Corsair 800D with a small spacing between them and the AX1200i Metal Case = a capacitor.
Increasing the distance between two capacitors reduces the capacitance and increases impedance.
Holding my hand on the PC case allows my system to boot up when it is stuck in a reboot cycle. The PC case is one side of the capacitor at RF. I would be grounding the side of the capacitor and diverting current from flowing through the PSU.
(2). It may be there is something wrong inside the PSU that gets fixed when I lift one end of the PSU slightly , (we are talking a few mm) but that does not explain why touching the PC case during multiple reboot gets my system to start.
(3). Alternateively lifting one end up created a better earthing contact between the PSU enclosure (which is earthed to the mains), and the PC case.
My temporary solution.
I have placed 4 layers of thin card paper at one end of the PSU to keep it a fixed distance from metal strips at the bottom of the PC case.
My system is working fine now for days.
I can remove the card and guarantee the problem is back. I have tried this many times now.
I am able move the PSU cables around and the system works fine.
(1). Remove the AX1200i completely.
(2). Check that the case of the AX1200i is grounded properly.
(3). Run a continuity test between the PC case and the PSU case. I assume they are supposed to be connected through the screws on the back of the PSU.
(4). Ground my PC case using earth straps.
Please send me your feedback / ideas on this.
Edited by colesdav - 2/10/16 at 4:23pm