are you receiving a specific error from cgminer or does the computer just not detect the 8th unit?
Thank you for replay 419mining, love your online store and ebay

. As soon as i plug the 8th newpac this is what keeps repeating. As soon as i unplug the 8th newpac it goes back to running normally.
USB init, open device failed, err -12,
You need to install a WinUSB driver for - GSH device1:23
And associate - GSH device 1:23 with WinUSB using zadig
See README.txt file included for help
GekkoScience detect (1:23) failed to initialise (incorrect device?), reset