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upon turning on my new computer a black screen appears with message Invalid Signature detected

HP Pavilion 590-0050
Microsoft Windows 10 (64-bit)

Immediately upon turning on my one month old HP Pavilion computer (Windows 10) this AM I was met with a black screen and a red message "Invalid Signature detected...check secure boot policy in Setup".   I don't know what a "secure boot policy" is and can't get into "Setup" to find out.  Hitting enter brings up a blue message "Boot device not found insall an operating system on you hard drive, etc.  After that nothing happens.... The HP agent(s) keep trying to get me to enter problems, data, solutions on to a machine that I can't open...  It worked perfectly 24 hours ago--and I was only reading emails at the time.   How do I get past the first and second messages into the rest of the "stuff?"

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upon turning on my new computer a black screen appears with message Invalid Signature detected

Assuming BIOS setup is the first message- immediately after powering on start tapping the Esc key. This should bring up a start menu where you will have F10 BIOS Setup. Tap F10 key. Not having that model I don't really know where various settings in BIOS are so I would suggest to simply look for an option to reset to Default settings then Save and Exit.

The other message is a bit more ominous and could indicate hard drive failure.On the other hand- It might  be solved with resetting BIOS to Default settings if the machine is not looking for correct boot device.

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