Monitor doesn't come back from power options sometimes

highstream

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I have screensaver off in Win 8, now 8.1, but in power options (high performance) I've set the monitor to turn off (go black) after 20 minutes of inactivity. Normally, when I come back to the computer, tapping the Escape key brings back the desktop in short order. However two times lately, one about a week ago in Win 8, the other just now in 8.1, there's been no screen response and I've had to shut down the computer and reboot. It's the monitor not responding, not the computer, which for example just now was still playing music at Spotify when I came back. I assume it has something to do with power options, but I can't figure out what. Any ideas? Thanks,
 

My Computer

System One

  • OS
    Win 8.1 Pro x64
    Computer type
    PC/Desktop
    System Manufacturer/Model
    DIY
    CPU
    i5 4690K
    Motherboard
    Gigabyte GA-Z97X-UD5H-BK3 (rev. 1.2) UEFI Bios
    Memory
    16 GB (4x4)
    Graphics Card(s)
    Sapphire Ultimate HD7750
    Sound Card
    JCAT USB
    Monitor(s) Displays
    Dell U2412M
    Screen Resolution
    1920x1200
    Hard Drives
    Samsung 850 Pro 256 GB SSD
    Seagate 3TB, 2TB & 1TB HDDs
    PSU
    Seasonic x650 PSU
    Case
    Cooler Master Elite 335
    Cooling
    Prolimatech Megahalems Rev. C cooler, 3 Nexus Silent Fans
    Keyboard
    IBM Model M
    Mouse
    Bornd Wireless Mouse
    Internet Speed
    60+ mbps claimed
    Antivirus
    Comodo CIS, MBAM Pro
    Other Info
    PS Audio Directstream dac, Quad 12L powered speakers, Core Audio Tech Kora LPS, JCAT USB card, Uptone Regen USB
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