I’ve noticed lately I’ve been recommending similar troubleshooting steps for KVMs before going into more technical concerns. We have the KVM FAQ, it’s a great resource, but it is quite long winded. This is my “to-the-point please help me troubleshoot” suggestions for you to exhaust.
If none of these options helped you, however, feel free to make a post and we will try to help you further 
Power cycle your KVM (and everything attached to it)
Solves:
- A whole bunch of stuff. Lol
- Connection issues between KVM and monitor
- Error states from technology that decided to not play nice together
The KVM and peripherals can get into an error state for various reasons. For instance, when you try to handshake with your monitor, your graphics driver can just give up after a while.
How to power cycle:
- Unplug everything. That’s right, even unplug your monitor’s power cord from the back of your monitor.
- Leave it! For like 5 minutes. This guarantees any capacitors have run out of power.
- Plug everything in except the KVM power supply.(1)
- Lastly, plug in the KVM power supply to turn it on.
(1) Instead of plugging everything back in, you may need to plug in only 1 monitor/1 PC/only a keyboard for other troubleshooting.
Check/Replace your cables for better, shorter, ones
Solves:
- Flickering displays
- Monitor refresh rate is not as high as it should be
- Monitor tries to connect, but no image on screen.
Cables/cable companies are known for how terrible and loose their standards are. If you have other DisplayPort/HDMI/USBC cables to try, definitely give those a go.
If you plug a cable in normally from your PC to your KVM, this doesn’t really mean much. The KVM sees an entire row as 1 long cable, and the longer your cables are, the more bandwidth you’re potentially losing due to signal degradation.
If you’re experiencing this flicker and have no cables/none that work, we sell them on our store for pretty cheap, Club3D has good cables, or for long distances, you might even need fiberoptic cabling.
Things to keep in mind about cables and KVM placement…
- Keep your KVM as close to your PCs and monitors as possible so your cables can be as short as possible.
- Even cables that come with a monitor are not trustworthy. You’d be surprised with how much they skimp on cables, even on high end monitors.
- Keep anything that cold be causing interference away from your KVM. Battery backups, guitar amps, etc.
Reinstall Nvidia drivers
Very common solution.
Solves:
- Weird sleep behaviors
- Black screen when switching unless you turn the monitor off and on
How to reinstall Nvidia drivers:
- Go directly to your display driver manufacturer site.
→ Nvidia
→ AMD - Fill out the manual driver page.
- Download the latest version.
- Install – when installing check the “clean installation” box.
- Power cycle everything.
Add a ground loop isolator
Solves:
- MOST analog sound buzzing/hissing
Example of one to buy:
Try a different USB port
The white USB ports on the KVM are called HID. HID is a driverless technology. We make use of it in our KVMs to provide a universal-compliant hotkey experience. However, some device manufacturers violate HID spec in their mice, keyboards, etc. If it does not work in this port, unplug it and plug it into one of the blue USB 3.0 ports (On most of our KVMs, there is 1 blue USB 3.0 port on the front, and 1 on the back).
Finding the troublesome USB
Solves:
- “USB flakiness”
The “HID stack” its called can be messed up by a non-HID device being plugged into a HID port (The white/black ports). 1 USB can affect the other USBs around it (crazy right?).
After power cycling your KVM, try one USB at a time in the HID ports to see if that particular peripheral works. If it does not work, it will have to be plugged into one of the blue (USB 3.0) ports.
If the problem USB device is a keyboard, you can use a dedicated macroboard (small keyboard) to map hotkeys.
I’m sure I’ll think of more things to add in the future. Hope it helps!