User: admin
Pass: sec00000
Category Archives: Printers
HP Officejet Pro K8600 – Reset IP Address / Networking
To reset network address to default (DHCP)
Press and hold the power button (light goes off but unit stays on), then press the X button 23 times, Let them both loose.
Wait about 20 seconds, and print yourself out a configuration page (by holding X until printer starts working to print).
Source: KFMiles on HP Forum