I just purchased a self powered 4 Port USB hub for my computer. I also purchased a 4 Port USB hub that is not self powered. I can plug both hubs into my computer and find the hubs as Generic USB Hubs in my Hardware Device Manager. If I look at the properties of both, they say that the device is working properly and I can see that there are 4 ports available for each one. So, I am assuming the USB ports on my computer are working properly. However, I cannot get the computer to recognize anything I plug into either one of the Hubs...if I plug something in and look in the device manager, it still shows that I have 4 ports available. The only exception to this is if I plug the non-self powered hub into the self powered hub. When i do that, i get a light on the hub acknowledging that there is a device in that Port and my device manager shows that there is a 4 port hub using one of the ports on my self powered hub and that 3 ports are now available. Thus, the only device my computer will recognize plugged into the hubs is another hub. Having seen that, I tried plugging a device into the non-powered hub while it was plugged into the powered one, but no luck, the computer did not recognize anything then either. Items I have plugged into the hubs are a set of speakers, a wireless network receiver and a wirelsss keyboard and mouse receiver. I have sense plugged the wireless desktop directly into a USB port on the computer and it is working fine, so again, I think my USB ports are working ok. My computer is an E Machines T3418 with 512 of Ram. Is this just a case of two non-working hubs, or is there another issue I have to solve? Thanks.