# NB Fujitsu
$arrmac = @(Get-CimInstance win32_networkadapterconfiguration | select description, macaddress | where {$_.MACAddress -ne $null } | where {$_.Description -match "PCIe" })
# NB Acer
# $arrmac = @(Get-CimInstance win32_networkadapterconfiguration | select description, macaddress | where {$_.MACAddress -ne $null } | where {$_.Description -match "Ethernet" })
$mac = $arrmac[0].macaddress -replace ":"
$computername = "NB-" + $mac
Rename-Computer -NewName $computername