Asset Scan failure

A laptop harddrive failed and the technician replaced it with another harddrive (the laptop name, serial number, etc remained the same), Within Assets, the laptop was still displayed but when he went to Scan Now to run an update on this laptop a failure message popped up. I saw the laptop that he forced a scan on and it was defiantly connected to the network at the time of the forced scan. Reason this occured? Look at the attachment for the error message

My second question regarding scanning, if an asset had shown up within the assets assigned to user A, was brought back and redeployed to user B, will SDPlus, when it does its daily scan, assign this to B or does it just show the last login as B and it is still assigned to A? Do we have to manually switch who it is assigned to?

LG