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I have a hp probook 4540s laptop which has a fastboot option in bios. But I have heard that it reduces many tests done when booting up.

From my understanding win8 needs a bios test to check whether hardware changed, so that it can perform a fastboot if hardware hasn't changed.

Will windows be unable to use fastboot if i enable bios fastboot?

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fastBoot in BIOS means activating Graphics Output Protocol of UEFI which speeds up boot because the old VGA is no longer used. I can change this setting without having issues to boot Windows 8. If you try to dualoot with Windows 7, disable it again.

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Interesting, can you explain (even short) why diable it for windows 7? –  Psycogeek Sep 13 '13 at 5:08
    
@Psycogeek Windows 7 simply doesn't support GOP and hangs at the boot logo. –  magicandre1981 Sep 14 '13 at 7:00
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