I can get to the internet and all, but it takes like 15 tries to get onto bnet, and I'll usually lose connection after a couple of minutes - I updated the system bios - which improved things, but still will eventually lose connection.

Disabled the on-board nic, and tried 2 different PCI nics - have tried different speeds, etc. - same issue.

Have connected my work computer (hp laptop) and no problems

Comcast tech support says they can easily see my modem and machine.

Anybody else run into this?

Studio XPS 435
IntelCore i7-920 processor(8MB L2 Cache, 2.66GHz)
6GB Tri-Channel DDR3 SDRAM at 1066MHz - 6 DIMMs
ATI Radeon HD 4850 512MB