In order to recover your HP computer from a USB flash drive, first of all turn on your system and then get the USB flash drive inserted then press the power button in order to turn off the system get all the devices and cables disconnected from the system then immediately press the escape key until you see the start up menu appearing on the screen. Then on the keyboard press F9 in order to open the Boot device menu then select the USB flash drive and then press enter, then follow on screen instructions for creating a back up of the data in order to start with the computer recovery procedure, if you still need any sort of help or support then ask for it at HP support number UK.
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