we have a batch of new 5040's
I have had SEVERAL users complain about flickering/blanking monitors-- the one I am looking at now--both monitors will blank out and return. it was doing it probably every minute.
unplugging one or other monitor does not fix it. will still blank existing monitor
no real commonality other than 5040's
bios / drivers are up to date
originally on a dell 19" on DVI (DP-DVI cable)-- blanked/flashed
new monitor--24" dell on DP (DP to DP)-- still does it
I am beginning to think there is a big problem with these display ports on the 5040's
also note that these users have two or three monitors each.
This is becoming a real thorn.
I'm seeing this this precise problem with Optiplex 5040 systems with HDMI and 2xDisplayPort connections on board. I'm using Acer monitors, very inexpensive no-frills model V246HQL; not sure that matters.
Symptom: system works OK with a single monitor, via HDMI or DisplayPort to HDMI. System will not cold boot with 2 monitors connected if the monitors are HDMI and powered on. Turning one monitor off lets the system boot OK. Switching to a DisplayPort to VGA adapter works around it; and using an HDMI/DVI adapter plug also works around it.
Notable: this was after BIOS upgrade to 1.5.7, and 1.5.9. This was working on BIOS 1.2.7... I should have left it.
Onboard ePSA diagnostics will hang at "Video Card" test if 2 monitors are connected.
My workaround: use DisplayPort to VGA adapters, and connect 2 monitors via VGA.
A motherboard swap fixed this on one system. I'm about to have the second system repaired too under warranty.
I think this might have something to do with HDMI and DisplayPort display handshaking. I'm betting a future BIOS update might finally resolve it.
thanks for the reply. its been driving me crazy. it does point to a bios issue in your case (dell mistake) and my systems are up to date with the latest BIOS (because I am stupid enough to believe that updates are SUPPOSED TO FIX <profane>). Dell, can you please look into this? PS, on a side note, my personal system did this today. sigh 😐
dang it dell-- you have any ideas? mine just started doing this again out of the blue
it goes blank, makes the "ding-dink" like something got unplugged, then the screens come back on and it makes the sound like a device was plugged back in
I see there are four other threads/posts with similar problems
There is something not quite right about the 5040 onboard display. I see machines occasionally just refuse to display anything, no output at bios etc. Only thing that cures it for me so far is shutdown entirely and remove power, then. drain power. by pressing power switch for anything residual in capacitors.
Then plug everything back into the mains and it's ok again. I'm hoping a bios upgrade will solve this but just thought I'd share my experience as were only using single screens via the display port output.
we opted for MB/replacement and getting GOOD video cards. DELL was less then zero help in this.
bad for them...we are now looking at other companies for our main PC line.