All monitors shut off , yet Pc still runs ? 6990 4 gig * Problem Fixed

I have a Weird problem I cant seem to diagnose, i have a 6990 4 gig and 3 Samsung bx2331 monitors..
my system is top of the line, randomly my monitors will just shut down, right before that happens, i hear a slight click and * I think a fan in my pc * specifically the graphics card fan shuts down , yet continues to run on default speeds. this will happen on random,
cant seem to pin point it..

it just happens randomly like the video card lost some voltage. or something.

my spec: all parts new and sent them in for testing. came back no issues.
t600 case
Gigabite 990fx board
6990 4 gig
1, 128 samsung ssds
4, 1.4 Tbite drives
850 watt gold edt Oz Psu
1090 t Amd 3.2 processor /w h80 water cooler
16 gig ram vengeance
basic Blue ray /dvd rom
torando cooler 220 fans etc
windows 7 ult

graphics drivers 12.11 beta Ati
tryed different drivers and doesnt make a difference
all other Pc drivers installed and up to date
checked all the monitors on different Pc.. monitors work fine..
swapped out the mini disply port cables and all monitor cables
Gpu, Cpu etc all runs cooler then overheat specs by 20-30 degrees

Can not pin point this , need some help..
Maybe Psu not supplying enough voltage ?
any other thoughts plz

2 answers Last reply
More about monitors shut runs 6990 problem fixed
  1. Definitely a problem with the PSU. Try using different power connectors. Your PSU should be able to handle it.
    Make sure that in power options you haven't selected the monitors to shut off after some minutes of inactivity.
  2. I fixed the problem, for my PC related issue it was a bad power supply, specifically a bad 12 volt, rail on the PSU , Sent it back to OCZ they carry 5 year warranty , received the new one, installed it and no problems.
    I hope this helps someone else...
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