because it already has a login name and password and I cannot gain access.
I suggest you do a factory reset and put it back to the day it came as you do not need any data off the drive. HP Recovery Manager can either be accessed by the recovery partition or the recovery CD.To launch it from recovery partition, press 'F11' key on the keyboard when the system boots. The system will come up with the HP Recovery Manager.
this model is now obsolete A bad design from HP, essentially the computer gets so hot that the graphics chip slowly pulls it's self away from the motherboard. Will be OK if its had a refurbished motherboard fitted