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Hi my friend has a samsung NP530U3C and he has changed the bios to CSM only now it stuck on a loop and will not boot up, the options "F2 setup" "F4 recovery" are there but they do nothing.I have a bootable USB with win 8 that "installs" right up to restart then....back to the loop or in stall.Please can some one help its been driving me mad i just need to get tothe bios and change it back to EFI/CSM. Thanks.

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Changing UEFI to legacy BIOS/CSM shouldn't prevent you from entering the BIOS. Are you saying the key to enter the BIOS is completely ignored now? –  Karan Jul 16 '13 at 2:48
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Another way to enter BIOS is to hold the shift key while you press restart-> troubleshoot->advanced options->uefi firmware setting->restart. when you get into BIOS, go to advanced, disable fast BIOS mode,then go to boot,disable secure boot,and you will have the OS mode selection where you can choose CSM OS.

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