I have an old Toshiba Satellite laptop with Windows 7 on it and recently it started having problems on boot. This is the laptop: http://www.pcworld.com/product/1327951/toshiba-satellite-a205-s5812-notebook.html
When i power on the laptop it freezes before reaching the bios screen and sometimes it freezes on the bios screen loading. The laptop has two usb ports and i think they are the reason for this freeze on boot because when i unplug the mouse and the keyboard from the usb ports the laptop boots normally.
Also, sometimes Windows 7 freezes randomly and i have to power off the laptop because it becomes completely unresponsive. In Windows event log it shows only this error: "The previous system shutdown was unexpected" event id 6008. But i think this is also caused by the usb ports.
If the usb ports are causing this problem how can i fix it? I don't think usb drivers are the reason for this because the Drive Manager doesn't show any problems with usb drivers. Is it possible there to be some bad physical connection between the usb ports and the motherboard?