When you say you have "reset laptop to factory settings" what exactly do you mean? E.g. do you mean that you have used the supplier's recovery procedure or what?
In ability to acquire an IP address could be symptomatic of several things:
- Your firewall is blocking it (maybe your firewall isn't set up to allow the local net's range of IP addresses [presumably as controlled by your router] to pass through). Maybe coaysed by the "factory reset".
- If using a wireless connection to the lappie, is the router set up to only allow wireless connections from known MAC addresses [a MAC address is the globally unique ID of each network device] and is the lappie's wireless MAC known to the router.
- Has the lappie been set-up (since reset) with all the necessary information to access the network (e.g. for wireless this may include SSID, passkey, channel)