Hi all, we are using Lattitude D520 docked into port replicators, model number PR01X. When using an original Dell external keyboard and mouse in the USB port of the docking station these devices doesn't work. Connecting them via a PS2 adapter it's the same behaviour. Connecting a Logitec mouse and keyboard via PS2 adapter everything works fine. Using the Dell devices and changing the power supply adapter from model PA10 to PA12 it works for some of the port replicators. Any ideas what is wrong ? Are the power supply adaptors to weak for that purposes ? Many thanks in advance Jörg