If F2 does not work to get into BIOS, try: Esc ... or F10 ... or F12 ... F1 ... Del.
In the case of Del , Esc , it may be possible you have to press the button various times.
Different bios can respond to different keys. If you know the motherboard model, try searching it on Google , etc. ... or direct on the Sony www site.
Hope it helps.