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This modem is USB 1.1 rated, this means that it requires the maximum power of 500mA. It has been found however that some of these modems pull more than the stated 500mA, you can see more about this here. Some motherboards, do/may not supply the full power required. If this is the case the modem begins to draw too much power from your system. When this happens, your motherboard may trigger a self-protection feature, which shuts down the USB ports. If you have any other devices attached to the same USB port remove them to see if the problem resolves. Some users have found that a powered USB hub or a PCI ADSL modem helps to resolve this issue.
Some users have found that the drivers v. 1.4 - shipped with the modem are the cause of the problem. By updating the drivers to the latest version of 1.6 users have found that the modem works more reliably. You can get the latest drivers here
There is also a known conflict with this modem and Via chipset in a number of motherboards. By installing the latest Via 4 in 1 drivers this problem is normally resolved here