Solved Graphics card working properly?

GRoston

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I recently replaced my computer’s monitor. From a graphics perspective, my computer has a Radeon RX 560 series, driver V27.20, graphics card and a Samsung Odyssey G51C 32" monitor. Looks great.
However, when I jiggled the mouse to wake my computer, the monitor sometimes took ~15-30 seconds to engage. I know that the monitor was on because icons of the three connection ports appeared, one at a time, in the upper left corner. I also know that the computer was on because I saw the disk access light flash.
Today, after several minutes of no image appearing on the monitor, I used my laptop, remote logged into my desktop, and then rebooted. After rebooting, the monitor was on without issue.
Question: Does this pattern of activity suggest that something could be wrong with the video card?
 

My Computer

Computer type
PC/Desktop
OS
Windows 7 x64 Pro
CPU
Core i7 860 @ 3.8 GHz
Motherboard
MSI P55-GD80
Memory
16 GB F3-12800CL7D (DDR3 1600 7-7-7-24)
Graphics Card(s)
Sapphire Vapor-X 100283VXL Radeon HD 5770
Monitor(s) Displays
NEC LCD3090WQXi-BK
Turns out that the HDMI cable needed to be replaced. Problem resolved.
 

My Computer

Computer type
PC/Desktop
OS
Windows 7 x64 Pro
CPU
Core i7 860 @ 3.8 GHz
Motherboard
MSI P55-GD80
Memory
16 GB F3-12800CL7D (DDR3 1600 7-7-7-24)
Graphics Card(s)
Sapphire Vapor-X 100283VXL Radeon HD 5770
Monitor(s) Displays
NEC LCD3090WQXi-BK
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