KVM Switch - Can't switch between cmoputer and the 360

So I just bought a KVM Switch mini size, the guy at the store told me that it would do the trick. The trick meaning that I would be able to switch between the Xbox 360 and the PC with no problems, at first I had a lot of trouble getting it to work until I realised that I had forgotten to plug the keyboard cable into the KVM Switch. At least I managed to get things to work... A bit.
The problem is that I manage to switch between the PC and the 360, but once I've switched to the 360 it immediately goes back to the PC. I've checked everything in the manual and I'm doing it "right" as far as I know:
"7. Switch between the computers (PC1 and PC2) by pressing the 'Select' button on the front panel.

  • Use the 'Hot Key' command on the keyboard. Press [Scroll Lock] quickly twice and then [1] or [2] to switch between computer 1 and computer 2."

Whenever I do this the KVM Switch beeps, switches to the 360 then back to the PC, could anyone please give me a hand?
 
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