PC problems when plugging up iPhone...

Okay I just had something weird happen. When I was syncing my iPhone, my pc turned off and the reboot button light was yellow'ish orange and it wouldn't let me turn it back on until a minute or two had pass.
Any idea why?

It's only with my iPhone too. I can plug up my iPod and I have no problems.

It's not every time, as I had it plugged for a few hours to my pc yesterday. I plugged it up today and both times within 5 minutes my pc shuts off and I have to wait 5 minutes or so before I can power it back on.

The fan seems to be work as I feel air in the back, I don't have the problem when I am browsing the net or doing anything else, only when I plug my iPhone in.


Weird...

 

Don't know what the deal is...

I have had it plugged up off and on now for the last hour and half and not had that problem.