On 9 Feb, 14:22, Louis wrote:
> Hello !
> I own a Trendnet TK-208 KVM switch, which was working perfectly with
> all the equipments I connected to it in the past.
> Yesterday, a friend of mine brought his HP Pavilion a1747c tower for
> maintenance purposes. I was surprised to find that the keyboard and
> mouse (both with PS/2 connectors) won't work at all when connected via
> the KVM switch, neither with the OS running (Vista Home Premium) nor
> when booting from a CD.
> I made sure the BIOS was at the latest version (5.07) and that PS/2
> mouse is enabled in the BIOS settings.
> BTW, plugging the keyboard and the mouse directly in the computer works
> as expected.
> Using the KVM switch with any other computer still works, so I guess
> it's not the switch which is defective.
> Any idea ?
Your symptoms do not really necessarily match this problem.. Of one
computer , not just not working, but screwing up the whole thing.
Nevertheless, to be sure,
Do this test..
turn them all off (such that if you hit the power button they will
Now plug a ps2 keyboard into each of them. See if there are
differences between the computers. Specifically if perhaps the
keyboard flashes when you plug it into the funny one, but does not
flash with the others.
(if the computers were all on then when the keyboard in plugged into
the Ps2 port, it would flash with all of them)
There is an issue with motherboard/BIOSs set to 5V SB(e.g. power going
through ps2 port even when computer is off, or power going through usb
port, or both), clashing with KVM switches that get their power from
The KVM switch thinks the computer is on, when infact it is not.
Note- just because a KVM Switch has an ACDC adaptor does not mean it
does not get its power from Ps2. I had one that got its power from
Ps2. And if you wanted to give it additional power, then you could use
the ACDC. >> Stay informed about: HP computer doesn't work with a KVM switch..