pc not picking up any more then 2 usb miner. any ideas?

[kien109]

so, i got 3 of the new u2 minner and i use bfgminer to min with them. but for some reason my pc would only pick up two out of the 3 miners. i have tried different hubs and different pc's but the results are the same.(i have even plugged them into the pc it self) the code i use to start up bfg miner is this
 "cd desktop\bitcoin\bfgminer
bfgminer.exe -o stratum.bitcoin.cz:3333 -u kien109.worker3 -p test --set-device antminer:clock=x0981"
 the hub is a Amazon 7 port hub with ac power
any ideas? or is it just me that has this problem?
different combo's of the miners shows me that they all work

[paulsonnumismatics]

Sorry for not helping you on the matter, as i dont know, but i had to say this:

USB mining is so 2013...   

[vnvizow]

Try a different mining software maybe? Or your PC's memory can only clock up to 2? Not really sure

[ankan]

after plugged in can you check the com ports in device manager and see if they are detected ?