Hi, thanks for answering, I don't know anything about electrical problems, all I know is that after MS updated to 2004 version, the usb ports started playing up....usbkey IN - USB MASS STORAGE DEVICE ERROR and usb ext ssd IN - USB ATTACHED SCSI (UAS) MASS STORAGE DEVICE ERROR!!! Doesn't happen ALL the time, but if I leave the usb ext ssd IN and leave it, it circles through 'the connect and dis-connect' sound you get when you plug as usb device into the laptop.....if I reboot with usb ext ssd (or usbkey) plugged in....it MOSTLY works and I can use it easily???!!! pss-ing me off!!!!!Loose connection possibly or an electrical issue with the port. Does it happen on all the ports or just one?