3rd monitor causing failed boot

Crackhead1 · May 15, 2013

Hi all,

seeking help/advice on an issue i have been experiencing since hooking up my 3rd monitor.

i have attempted to google but cant seem to find another situation like mine, or im not entering the right search parameters.

system:

i7 3820

gigabyte x79-up4

1x gigabyte wf3 7950 with fx1 bios

3x dell u2312hm

850w silverstone strider gold evolution (previously running trifire)

16 gig gskill rip jaws @1866

256gb m4 ssd

now ive had 2 monitors running for ages with no dramas, hooked up as follows #1 dvi-dvi, #2 mini dp -dp

the other day got my 3rd monitor and hooked them up as follows # 1dvi-dvi, #2 mini dp-dp, #3 mini dp-dp

since hooking 3rd one up i have found it will not boot/resume from sleep while all 3 are hooked up, i'll press the power button and nothing happens, no lights, no fans nothing. i decided to change the newest dp cable, with a different issue occurring upon change over. now it will just not turn on the dvi screen and only power up the 2 dp screens.

previously this was a bit of an issue as to get it to boot i would need to unplug the second dp, unplug and replug the 24 pin atx to get a boot/sleep resume. then just replug and re activate the 3rd monitor in catalyst control centre and all would be good.

now tho, if i do the above, the screens will all work for a bit then the 3rd will drop down to some stupid low resolution, if i change it back to 1080 again it will do the same thing after about 30 seconds.

i have tried switching cables and ports around

tried changing gpu bios ( no matching bios available on gb site for my card/bios)

driver is up to date

im stumped as i didnt think a 3rd monitor could cause a failed boot.

any help or advice yall could offer would be great

feel free to ask for any info required i may have left out.

thx all