Dell Precision tower 3420 black screens..

[computertechguy]

In an office today the dell precision all have some sort of video issue, they all run 2 screens. The complaint was mouse but no video. Simple thought you reboot or drain the power to fix, because team viewer on them is working so they are up.

One had a HDMI running one monitor and display port running the second. Once I pulled the hdmi off the pc the main monitor came on. Plugged the hdmi back on and both screens went black. Found a spare display port adapter and that got both monitors working.

Tehn a second pc went to a black screen, this time it was a display port cable, so took the display port out and plugged in an hdmi monitor worked.

Third pc I tried to reuse a spare disply port cable (as the hdmi port was in use and working) but that second monitor would not come up.

I think there may have been a bad update sent out from Microsoft, but I haven't seen anything else about it now.

YES, i checked for driver updates (intel HD 530?) and there werent any but the intel video driver downloaded from Dell's site would not install gave a not compatible error.

 

[Blues]

I forget which models had this but I know when using multiple displays on select systems one of the HDMI ports and one of the DisplayPorts were sort of seen as the same or shared some resources and you had to move the DP connection to the unused DP.