Turnyour Acer Aspire One laptop off. Now connect the bootable USB stick to the port. Press the power button and press the F2 button as soon as the Acer Logo appears. Now go to the Boot by selecting with Right Arrow. Use F5 or F6 key to change the order to USB. Finally, Reboot your Laptop.
Youmight also have to turn on the F12 boot menu Click on "Like" if you find my answer useful or click on "Yes" if it answers your question. For most Acer desktop PCs, try continuously hitting F12 key while booting up. The boot menu will show up.
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acer aspire one boot menu key