What operating system are you running ? I too have Trust bluetooth mouse and cheap Dongle from Argos. To cut a long story short I had endless problems -- everytime an issue or lockup occurred it seemed the bluetooth was at the bottom of it. I was initially using the BlueSoliel software supplied but gave up on this. 16 Months ago changed from X.P. to Vista via the free offer that came with notebook. I was pleased to find Vista's own drivers worked perfectly -- well untill 12 months ago. There was a windows update that stopped all functionality of the bluetooth. I could restore back and bluetooth worked !! So I "hid" that particular update and carried on but subsequent updates must have incorporated whatever the problem was and that was that. I ditched it and use a normal wireless mouse (Still Trust) that's been great. Never resolved the bluetooth issue, asked on this forum and never received any replies. Like you the mouse is discoverable but nothing is ever found.