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So it's the monitor that flashes red? I would try the monitor on a PC to determine if the monitor is good. If not, replace monitor. If monitor works on a PC but not the KVM, power cycle the KVM. Depending on the model you may be able to do a hard reset. On other models you can access the KVM via IP to determine if there is an issue with the KVM.
Check that you are getting power to your StarView SV211K 2-port KVM switch. Try disconnecting the power, and then reconnect it, to "reset" the KVM. Check all the cables from port #1 on the KVM to computer #1. Check all the cables from port #2 on the KVM to computer #2.
Check all the cables from your Keyboard/Video/Mouse to the KVM.
If you still have a problem, disconnect everything from the KVM,
and connect the Keyboard/Video/Mouse directly to computer #1,
to ensure that it works *without* involving the KVM.
In order to fully answer your question, a number of needful things must be inspected, reinstalled, confirmed, & tested:
Reset. Try the reset button. You could use a paper clip to reach the reset button through the pin hole in the lower front left of the Zonet KVM unit.
Inspect connectors. Each data/input/power connector/port requires all of its pins to be present & straight for full functionality.
Inspect the entire length of each cable & cord to ensure that each has no damaged area.
Seat each connector in the appropriate port of a computer that will be accessed via the KVM unit.
Electricity. Inspect all affected devices & confirm that each has sufficient, uninterrupted electricity.
It is possible for a Zonet KVM unit to display channel lights without direct power to the unit, but you should confirm that the unit is getting sufficient, uninterrupted electricity-directly through its own power cord. Unplug the KVM power cord & every connector & reseat each one (this performs a power reset on the KVM unit)-making sure that each connector is in the correct location (not just where it originally was). Thus, make sure that the keyboard, video display (monitor), & mouse are on the output side.
Press the power button on your monitor. If it does not turn off the monitor's power status light (Off/On/Standby), then remove the power cord from the monitor & reseat it-to reset the monitor's hardware. If it does not turn on the monitor's power status light, then the monitor is either not getting enough electricity or it has a malfunction which requires troubleshooting & fixing (possibly through a fixya.com thread for that monitor model).
Unlike USB devices, PS/2 devices usually require device connection prior to turning on that device. With that said, connect the keyboard & mouse KVM channel cable connectors to the computers & then turn on those computers that you intend to display through the KVM-connected monitor & then turn on these computers.
Any computer that does not turn on has an issue that requires resolving (just like a monitor that would not turn on).
Sometimes a keyboard/mouse interface issue can be resolved by replacing that interface device.
The KVM Unit. When all else properly connects & performs, what does not properly connect & perform has the issue &, hopefully, that can be repaired without having to replace it.
Yes, this product will do the job. An easier solution, although probably more expensive, would be to use a video card with dual outputs. Using a video card with dual outputs would allow you to see the computer's video on both screens simultaneously.
The switches are used when cascading more than a single BYTELAN KVM. It specifies the scan rate, and which KVM unit the keyboard and mouse are connected to. For a single KVM, use the default settings.
SW1 SW2 Scan Rate
ON ON 2 seconds
OFF ON 10 seconds
ON OFF 20 seconds
OFF OFF 40 seconds
SW3 NOT USED
SW4 ON For KVM unit with KB/mouse
OFF For other KVM units w/o KB/mouse,
If your power supply isn't adequate, it may cause your KB/mouse problem. It should be 9VDC with at least 500ma.
Hope this helps.