Question Monitor randomly turns off while PC stays on

benjamin4077

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Aug 24, 2016
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My PC config is--
CPU-Intel Core i9 9900K @ 3.60GHz
Motherboard - ASUSTeK COMPUTER INC. ROG MAXIMUS XI HERO
RAM - G.SKILL Trident Z RGB Series DDR4 Memory Module3200Mhz (8GB X 4pcs = 32GB)
Graphics card - MSI GTX1080 Gaming X - Twin Frozr VI - PCI-E Graphics Card (8GB GDDR5)
Monitor - DELL P2715Q (3840x2160@60Hz)
Power Supply - CORSAIR RMX RM1000X 1000W
SSD M2 - Samsung 970 EVO Plus 1 TB
HDD- Seagate Barracuda 2TB HDD (ST2000DM005) [6 hard disks]
OS - Microsoft Windows 10 Pro 64 Bit
CPU Cooler - NZXT Kraken X62

The problem - Monitor randomly turns off while PC stays on. Then monitor does not come back on. And I have to switch off the PC by long pressing power switch. It happens randomly, while watching video or working in Photoshop or on MS Word etc. and even while just browsing the web. Sometimes it happens after hours of using the PC. And sometimes minutes after starting the PC. After switching the PC off and switching it back on, the monitor works fine .... until it goes black again. And there isn't any "No Signal" warning on the monitor when this happens. It just goes completely black.

History - I have been using this PC since last 2 years and it was running OK till recently. Then last week the problem started without any apparent reason. There was no hardware change and nothing installed anew. I can use the PC fine and do everything until the monitor suddenly goes black.

I have tried the following so far without success -
1. Disconnecting and reconnecting all cables
2. Disconnecting my 27 inch monitor and using a 23 inch monitor. (It still happens)
3. Formatting the system drive and re-installing Windows.

And the problem still continues. Please help.
 
Do you have any other known working video cables to swap in for testing purposes?

= = = =

Look in Reliabiity History/Monitor and Event Viewer for error codes, warnings, or even informational events that occur just before or at the time the monitors turned off.

Start with Reliability History. Much more end user friendly and the time line format may prove revealing.

Event Viewer requires more to navigate and understand.

To help:

How To - How to use Windows 10 Event Viewer | Tom's Hardware Forum (tomshardware.com)