Why the screen below appear when I boot my dell Inspiron 7559? And dell logo doesn't appear? Therefore I can't access BIOS utility to boot the laptop from a USB flash drive. :
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![Solved] DELL Inspiron 15-3521 - BOOT with USB on Legacy does not work](https://obrazki.elektroda.pl/9492108700_1527791989.jpg "Solved] DELL Inspiron 15-3521 - BOOT with USB on Legacy does not work")
Solved] DELL Inspiron 15-3521 - BOOT with USB on Legacy does not work
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