The document here may help in doing a Factory Reset:
If this does not work for you I hope you have Recovery Discs either that you burned or from HP. If you don't have Recovery Discs you can contact HP Support to order a set. Contact HP
The document here may help in doing a Factory Reset:
If this does not work for you I hope you have Recovery Discs either that you burned or from HP. If you don't have Recovery Discs you can contact HP Support to order a set. Contact HP