PC won't boot up if hub is already on.

My PC won't boot up if the hub is already switched on.  It gets as far as the desktop image and freezes up.  (I have just swopped over to BT and am using the BT Hub).   BUT if I turn the PC on first, it boots up normally, and when I switch the Hub on everything works fine.  Can anyone help solve this mystery? 

It sounds like a faulty Ethernet card, or network settings on the PC. When it boots, it will try to obtain an IP address, while it is doing that, it will be stuck on the desktop.
It may be worth checking your network settings to make sure that its set for automatic IP.
As an experiment, could you please set a static IP address on your PCs network adapter, and see if it fixes the problem.
Please see
Using static IP addresses on your home network
This will mean that the PC will be able to carry on booting, as it will already have an IP address.
There are some useful help pages here, for BT Broadband customers only, on my personal website.
BT Broadband customers - help with broadband, WiFi, networking, e-mail and phones.

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