Hi there recently built a pc,sempron 2800 on a compatible motherboard with correct ram, the problem i have is when i plug a usb device into the pc mainly a broadband modem, what happens is the mouse freezes up and the back panel of pc heats up quickly, the cpu power supply etc are at there normal tempreature, Anyone got any ideas

does anything else plugged into the USB port cause these problems?
have you tried the modem on another PC?
did the modem work before?
can you use a etherenet cable to connect the modem?