Cold reset using the Preboot menu
1. Turn the product on.
2. The HP logo displays on the product control panel.
When an underscore displays below the HP logo,
touch the logo to open the Preboot menu.
3. Use the down arrow button to highlight Administrator, and then touch the OK button.
4. Use the down arrow button to highlight Startup Options item, and then touch the OK button.
5. Use the down arrow button to highlight the Cold Reset item, and then touch the OK button.
6. Touch the Home button to highlight Continue, and then touch the OK button.
HP 打印机默认账号和密码：
admin
password
均是小写；