Já experimentou as instruções da HP ?
- Turn off the computer.
- Disconnect all connected devices and cables such as Personal Media Drives, USB drives, printers, and faxes. Remove media from internal drives, and remove any recently added internal hardware. Do not disconnect the monitor, keyboard, mouse, or power cord .
- Turn on the computer and repeatedly press the F11 key, about once every second, until the Choose your keyboard layout screen appears, then follow these instructions: a) Click to select the keyboard layout. b) The computer restarts. If the recovery partition on the hard disk drive is functioning correctly, the Choose an Option screen appears. Click Troubleshoot .