Can you list all the devices you are wanting to plug into it for me? Might be a compatibility issue with a certain usb chip.
1. Dymo Labelwriter 400 Turbo
2. Livescribe Pulse pen (cradle)
3. iPod 2G sync cradle
4. USB keyboard
5. Logitech TrackMan Wheel
6. Stamps.com postal scale
7. ioSafe external drive (1TB)
8. Brother MFC-7420 Multifunction printer
9. iPhone4 sync cable
Items #1-6 are plugged into one of the two hubs I have. Items7 & 8 are plugged into rear USB ports on the CPU. Item 9, when in use, is plugged into a front USB port.
The machine is a CyberPower running an Intel Corei7-920 2.66 GHz with 6GB DDR3/1600 MHz Triple Channel RAM in three 2GB chips. The mobo is an MSI X58 Pro-E Intel X58 Chipset SLI/Crossfire DDR3 mainboard. Graphics card is a NVIDIA GeForce GTS 250 1 GB 16X PCI Express. It has an 850W ThermalTake power supply. There is a 64GB Kingston SSD as the main drive, with a 1TB WD Caviar Green drive for data.