I have many, many USB ports on the back of my system and two on the top.

The back ones are all through the same board connection and the top ones are seperate.

There are two hubs plugged into the back ones to allow for USB devices located away from my machine and I think this is cause me a power loss ..

I cant use anything else in my other USB ports .. the hubs only have two things connected each and they work, but anything else I plug into the back fails .. ?

I have to use the top ones.. but the devices connected to the hubs work perfectly .. is it a power issue ?

 

Are they powered hubs? (from the wall socket via a transformer)

 

no system powered

 

I think that may be the problem, get a powered hub, it's worth a punt.

Edit - a bit of reading here may help.

 

Sounds like a lack of power from your PSU due to the amount of power you are pulling from the ports. You can check the power being pulled in the 'device manager' under the 'Universal Serial Bus' -> advanced. Each one of the 4 hubs showing are pulling Around 10-11% on mine at the moment.