Just looked at the WWW and this modem is BUS powered so it is very possible your MB USB port does not have enough to sustain the connection... The Speed Touch USB At-a-glance: • High speed Internet access and regular phone service on the same line • Up to 8 Mbps downstream, 1 Mbps upstream • Supports Windows 98, 98 SE, 2000, ME, Mac OS 8.6 & 9.0, Linux • Connects to USB-port on desktop or notebook computer • USB-port powered (no need for AC adapter • Plug and play • Easy to use installation wizard • Software upgradeable • Approved for connections to all major network operators • ADSL standards compliant (ANSI T1.413 Issue2, G.dmt, G.lite) • Supports PPPoA, PPPoE and LAN functionality • No additional network interface card required Regards, BAH