Do a restart, '''not cold boot''', and press the esc-key
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The [http://dlcdnet.asus.com/pub/ASUS/nb/G750JW/E_eManual_G750JW_VER7780.pdf|Manual - ENG - pg74] states that it's the F2-key, but [https://rog.asus.com/forum/showthread.php?34035-Silly-Question-How-to-enter-BIOS-G750JW|this] forum thread on asus is stating the esc-key, which seems to have helped a few ppl.