CPU/Mobo Can't access BIOS on my Laptop

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Beatnik

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Beginner
I'm not able to access BIOS setup on my Samsung NP300E5Z Laptop. It directly goes to Windows 8 logon screen. I tried pressing F2, F1, Del and several other F-keys during startup but it doesn't work.
This laptop was being used by my brother and he messed up Windows and it needs a fresh installation. But i can't change boot device preference for which i need to get into the BIOS. Any help

Until yesterday it used to start with a screen written "System resuming" on the lower-left corner of it. But now it directly goes to Windows logon screen.
 
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