Just some thoughts...
Hi,
have you ever tried to use another browser? MS InternetExplorer for example has a function called "compatible view" I guess. As far as I can remember this function is enabled by default, so you have to manually switch it off in the menu (Internetoptions) if you like...
If I were you, i´d try to:
1) disconnect power
2) disconnect all usb devices connected directly or via usb-hub. Espacially any self-powered usb-devices (hubs, printers, external harddisks, etc.). Those self powered usb-devices sometimes route back their electric power back through the usb...