CGminer and a USB HUB 10 port. I can only get one Antminer U1 to run right.

[Old Man Miner]

I am using CGminer and a USB HUB 10 port. I can only get one Antminer U1 to run right. When I run 2 or 3 antminers they run for awhile and then go into a synchronized bilking green light and stop mining (no accepted work) but are still hashing. I am very new at this and would appreciate any guidance anyone can give me please. I have many questions .  I am using Windows Xp , CGMiner,Rosewill  10 Port 2.0 HUB and ANTMINER  U1’s.                                                                                                                                                                                                                                                       Questions                                                                                                                                                                                                                                                                                                                1: My HUB shows up  in Device Manager under Device type Universal Serial Bus controllers  as a(Generic USB Hub) Location 0 (USB 2.0 Hub) is this right?                                                                                                    2: When I plug in Antminer U1 it shows up under  Universal Serial Bus devices as Silicon Labs CP210)x USB to UART Bridge (COM5) is this right?                                                                                               3: When I plug in second Antminer U1 it shows up under  Universal Serial Bus devices as Silicon Labs CP210)x USB to UART Bridge (COM5) is this right?                                                                                     From here I am lost Please Help. OLD MAN

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[alexyno]

Looks like not enough power... You use external power adapter?

[-ck]

Windows XP struggles with devices that look identical to it, and falls over with more than 8 of the same device. You may never get all of them working well on that OS. Furthermore power could well be a problem as said.

[alexyno]

Can be also a OS limitation over a number of devices... but... The Antminers are seen by windows as COM ports and Windows can see max 256 com ports... as reference: http://support.microsoft.com/kb/100111

Most likely.... Power issue