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OK, I managed to fix the problem to my 'Critical Shutdown error' (kernel-power), but my other question is...
How do I access the bios? I have tried f10, f2, and f1 during bootup, but nothing.
My thanks for your input. 
Résolu ! Accéder à la solution.
Hi kriptikchicken,
Press the assist button when fully shut down. This will open Vaio Care Rescue mode – then F2 to enter BIOS setup.
Rich
MEGA! Thanks rich!
You're welcome:smileyhappy:
I've tried pressing 'Assist' to access the Vaio Rescue Mode, but I still get the Vaio logo and circling dots that eventually adds the notification 'Preparing Automatic Repair'. I've also tried pressing F10 as the system starts up, but with a similar result, but this time just goes straight to 'Preparing Automati Repair'. Any other suggestions?