Are you looking at the KVM? Does the display show anything at all? Maybe you are not waiting long enough. Also look at this thread: https://community.cisco.com/t5/unified-computing-system/ucs-220m3-auto-startup/td-p/2506436
Not sure about positioning on screen, but add this in your jabber-config file to have it launched in the open.
<Options><DockedWindowVisible>FALSE</DockedWindowVisible></Options>
