plug in to N900 the Y-cable with player attached and without power supply. Plug powered supply to Y-cable, immediately prior to pressing "VBoost on" in h-e-n, not earlier, not after pressing button. VBUS 5V at wrong moment will mess hostmode speed setting, applying too late will trip the 200mA electronic "fuse" in N900 vbooster. So 1st select speed in h-e-n GUI, 2nd plug in the external power source, 3rd press "VBoost on" - do 2. and 3. during a few seconds timespan (rule of thumb: <5s) [edit] right now that's irrelevant, this might change in future versions HTH /j