Miners don't detect ASIC Devices When I try to add devices to BFGMiner and BitMinter, Only 3/4 devices will be detected, When I go to Devices and Printers (In Windows 7) it shows all of my ASIC Miners.

Here is the error:

2014.02.26 [19:09] BitMinter Client v1.4.3 started 
2014.02.26 [19:09] Found 1 OpenCL-compatible GPU 
2014.02.26 [19:09]  Hint: Use performance mode for best GPU results (bottom right button) 
 2014.02.26 [19:09] Probing all ports for external devices 
2014.02.26 [19:09]  Probe of port COM16 failed: timeout 
2014.02.26 [19:09] No external devices detected. 
2014.02.26 [19:09] Device detected on COM15: Icarus 
2014.02.26 [19:09]  Icarus detection on COM3 failed. Expected nonce 0x00000109 but got 0x3F3F3F09. 
2014.02.26 [19:09] Device detected on COM3: Icarus 
2014.02.26 [19:10]  Icarus detection on COM17 failed. Expected nonce 0x00000109 but got 0xFFFFFFFF. 
2014.02.26 [19:10]  Icarus detection on COM17 failed. Expected nonce 0x00000109 but got 0xFFFFFFFF. 
2014.02.26 [19:10]  Probe of port COM17 failed: timeout 
2014.02.26 [19:10]  Error reading from COM17: File descriptor is -1 &lt; 0, maybe closed by previous error condition 
2014.02.26 [19:10] Device detected on COM16: Icarus


How can I get the miners to detect all the devices. The devices are on COM 3, 17, 19, and 20

Thanks,
Bgordy
You are likely running into power limits. Your USB hubs must be powered properly, able to supply the full current all of these devices need to operate.