Error when switching on(select boot image did not authenticate). legacy boot doesn't help. What is the reason?

Laptop HP RT3290 windows 8.1 License
When you enable get this error message select boot image did not authenticate.
Googled all offer a solution. Enable legacy support and disable secure boot. I did it and when turning on get an error "no bootable device insert boot disk and press any key". Weird on the forums all this solution helped me in what could be the reason?
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July 9th 19 at 11:23

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July 9th 19 at 11:25
The disk was replaced, added?
Before-what worked, what did?
Absolutely nothing. Just closed the laptop after 10 minutes opened, and here this error - Rod_Wolff21 commented on July 9th 19 at 11:28
How old is the laptop days? Still under warranty ?
The impression is that the problem with the disk problem if you have configured BIOS for some reason not changed......................I do not know. If it burns,try other resources,overclocking, etc. - mercedes commented on July 9th 19 at 11:31
2 years it has no warranty already) - Rod_Wolff21 commented on July 9th 19 at 11:34
is there ?)

e. Use the right arrow key to select Boot Options.
f. With Launch CSM highlighted, press Enter and use the down arrow to select Always. - mercedes commented on July 9th 19 at 11:37
well, still try to do recovery) only backup to do - mercedes commented on July 9th 19 at 11:40
this is not
e. Use the right arrow key to select Boot Options.
f. With Launch CSM highlighted, press Enter and use the down arrow to select Always. - Rod_Wolff21 commented on July 9th 19 at 11:43
there is generally a stripped-down BIOS - Rod_Wolff21 commented on July 9th 19 at 11:46

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