I have a HP TFT5600 RKM 221546-09 KVM monitor and keyboard. I lost power to the device briefly and it now is asking for a password to log on to OSCAR. If there ever was a password, it was set by my predecessor who did not pass it on. I have been told there is a way to reset the password.
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When you moved your pc you probably knocked the graphics card loose. You
can open it up and try re-seating it. Make sure you unplug the pc first
and then press the on button for 10 seconds to clear out all the power
from the power supply before opening the computer up.
Also, If you are using a KVM... Unplug the KVM's power cord for 30 seconds and plug it back in. That will reset it.
You question is unclear. Please specify the makes and model of all devices. I typically use Rackmount Monitor Keyboard combos with integrated KVM Switches for larger server applications. I have used quiet a few units from KVMSwitchTech and they work pretty well.
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.