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The 'Choose an operation system' screen on Windows 8 allows you to use the cursor keys to choose between the different operating systems, but I couldn't find a way to select:

'Change defaults or choose other options' 

with a keyboard.

I can use the mouse, but what if I don't have one?

In this case, the second OS is Server Core which does not need a mouse.

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What is wrong with Tab key? Or you can press arrow keys as well. – avirk Nov 12 '12 at 10:40
Arrow keys? Your keyboard has them right? – pratnala Nov 12 '12 at 10:45
@PratyushNalam cursor keys = arrow keys , so he has tried that . – rajat Nov 12 '12 at 10:55
whoops. in that case, tab should work – pratnala Nov 12 '12 at 10:56
@PratyushNalam check my answer, and for your information <kbd> tag doesn't work for comment. – avirk Nov 12 '12 at 10:57
up vote 8 down vote accepted

I just tried the Tab key which is working like a charm, while arrow keys didn't do the trick for me. So Tab key does the job as it do always inside the Windows.

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Use the Tab key. It worked for me.

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I have checked my own Samsung RC512 with the windows-8 Boot screen. I seem to be having no issues at all with Arrow keys or the tab.

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To select the operating system, use the up and down arrows, to tell the computer to actually boot into the selected operation system press Enter.

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