Greetings mate i have a cs64u aten/kvm switch to use with 1 keybord/mouse/monitor , my 4 pc's.So far it worked just fine for several months.Today i decided to change my keybord and mouse.As a result the switch no longer fanctioning nor it recognizes my new mouse.I tried to change back my old mouse and keybord and i only managed to make em both work , but the switch still refuses to change between my computers. any suggestions?

SOURCE: Password reset for ATEN kvm switch

If you are unable to perform an Administrator login (because the Username and
Password information has become corrupted, or you have forgotten it, for
example), there is a procedure you can use to clear the login information.
To clear the login information do the following:
1. Power off the CN8000 and remove its housing.
2. Use a jumper cap to short the jumper on the mainboard labeled J6.
3. Power on the switch.
4. When the front panel LEDs flash, power off the switch.
5. Remove the jumper cap from J6.
6. Close the housing and power on the CN8000.
After you start back up, you can use the default Username and Password (Login: administrator, pass: password).

SOURCE: I have an ATEN KVM

try login: administrator Pass: password

SOURCE: Lost the instructions for the CS62U switch

here is the link to the aten website.

http://www.aten.com/download/download.php#productGuide

go to the select quick guide section and locate the model # in there,
p.s. its cs not c5

SOURCE: Not working

Make sure your keyboard and mouse are plugged into the right USB ports on the switch. If you plug the keyboard into the mouse USB port the hotkeys will not work! The USB ports on the KVM switch are labeled under each port, with a mouse and keyboard icon respectively.From the Quick Start Guide/Manual: The Numlock hotkeys are listed as:
[Num Lock]+[-] [1] Switches to output 1
[Num Lock]+[-] [2] Switches to output 2
[Numlock]+[-] [A] Auto-scans and chooses which ever port is connected.
Alternatively: Tap [Scroll Lock] twice to automatically switch between ports.
Note: I've never been able to get the Numlock key combinations to work correctly. I always just use double-tap [Scroll Lock] trick to switch.
If you get stuck with your scroll-lock and Alpha lock lights flashing, just hit [Esc] to fix it.
Source: http://www.aten.com/download/download.php#productGuide (Scroll down to "Quick Start Guide" and choose CS62U out of the drop down).

SOURCE: My Altusen Aten CS62U-2 Port USB KVM Switch seems

It very well could be just a cable causing this problem, try switching around the cables to see if you can isolate the issue. It could be the KVM is not compatible with your monitors refresh rate though, I have seen this happen a good number of times. It will work but will blink randomly to allow the monitor to re-sync with the video card.. . I have a monitor currently on a kvm that does this exact thing. You may want to try another KVM if you can't get it narrowed down to certain cables.. there is a chance the actual KVM is causing this issue, but is not defective, it is just at a different frequency then the monitor.

Thanks so much
Tim