I think that is the problem with power supply or display hardware

Has anyone found a fix to this?   I just got my R11 this week.  I have been leaving it on over night because I have been running downloads and moving files from my old computer.  It was just fine until this morning.  My monitor is on but says no signal.  I even tried a different monitor and still got nothing.  The only way to fix it was to hold the power button down and restart the system.  Did anyone find a solution?

The only fix to the screens not powering on or displaying what you want is to turn off hibernate or sleep in the settings of your operating system. This does not fix the underlying issue of the computer freezing or hanging up but you can at least not have to worry about the monitors not showing an image. My issue was the computer would freeze while asleep and would not wake up due to no commands being sent to the cpu during a freeze/hangup. Granted my computer still freezes and i need to power it down but at least i can tell it froze now and not the black screen like you see.

Exact same problem.

No clue how to fix =/ 

I'm just being careful now to shut off my computer whenever I'm not using it since it seems to only send signal my Dell Ultrasharp 27 monitor upon startup. 

Am hoping we get some support from Dell =/ 

Try the solution here it may help if it is the same issue where the computer freezes but while in sleep or hibernate. I can now let my computer fall asleep or hibernate and it wakes right up now sometimes a little slowly but one button press and it wakes right up every time. https://www.dell.com/community/Alienware-Desktops/Aurora-R11-randomly-freezing/m-p/7654727#M30056

Disable hibernate

Disable or turn off USB sleep to save power in all usb root hubs

Disable or turn off WIFI sleep to save power

Disable or turn off Ethernet sleep to save power

Admin Command prompt

powercfg -h off

Turn PCI-E power savings to OFF.

Turn system sleep to 960 minutes or NEVER instead of 20 MIN.

Make Screen saver something other than blank like mystify.

I believe I had this problem a few years ago with another Dell system.  It was a corrupt hibernation file.  I disabled hibernation, rebooted, and enabled it again.  In my case, it solved the problem.  YMMV.  (I might have also run a chkdsk on c: before I re-enabled hibernation, but I'm not certain of that.)

https://www.cnet.com/how-to/how-to-enable-or-disable-hibernate-in-windows-10/

same here, when not using display run off but after few minute turn on again with no reasons... 

and computer never goes to slepp... anoying

The computer is hanging up otherwise known as freezing while in hibernation. I have the same issue and have found the source but not the solution yet it is related to corrupt memory in the RAM Dell Support will not give me replacement RAM at the moment but I just reseated mine and ran the tests and it says no issues but i am not holding my breath. When I  reseated the RAM i did switch the position they were in so lets say RAM modules 1 and 2 were in slot 1 and 2 respectfully and now I put RAM 1 in slot 2 and RAM 2 in slot 1. I did not try to check slots 3 and 4 yet

I'm having the same problem with my new R11 that I received mid-October.

What's more frustrating is I have set the power button to shut down the computer and when I can't wake the monitor sometimes, I'd rather press it to shut down the computer and boot it back in the windows for the display to work. However, whenever I have this issue where the display doesn't wake, the power button DOESN'T work either when I press it.

I literally have to hold the power button and force shut down the computer to get out of this problem and I've already had to reinstall Windows three times already because these force shutdowns corrupts files.

I've called their support and they literally just sit on the phone silent and dumbfounded like they don't know what's going on. I pay for Premium Support Plus and they can't even help me. This is incredibly frustrating. I never had all these problems with my R7.