Windows 8 Dowgrade Issue

Hello Everyone,

I recently bought an Pavillion 23  AIO unit (Model # 23-b034), i am wanting to downgrade the machine to Windows 7 Pro 64 bit.

But here is my issue..

I am trying to boot into the UEFI Firmware settings (BIOS), i selected the UEFI settings, the machine reboots... I see the HP logo and then WHITE SCREEN. I have to press the power to get it to shut down.

Any ideas? Please help!