White Screen when entering UEFI Settings

Hello All,
I currently own the P7-1414 HP pavilion desktop (windows 8).
I am attempting to install a graphics card and to do so was told i need to change some of the settings in the UEFI / Bios in order for it to work properly.
When trying to enter the UEFI settings (power> Restart + Shift>Keep Holding Shift>Troubleshooting>Advanced) after clicking the UEFI settings and then restart, my computer will restart and then will boot up to a white screen which will not go away without turning the computer off by hand.
Does anyone have any tips for fixing this issue? any help will be greatly appreciated.
Thank you
Note:
I also did change the power supply of the computer, i plan to test the UEFI with stock power supply later today.

Hi,
Repeatly tapping the ESC key after powering up the PC should be all that is required to get into the bios. However, if you are using Windows 8 then you might need to make a change in the Advanced Startup options to get the UEFI bios screen to appear.
If you get a chance, swap power supplies with your brother.
Some HP PCs have issues with power supplies over 650 watts.
Don't install the graphics card until you are sure that the PSU is good and your PC is stable. Then make the bios changes and install the card. Be sure that the power supply matches the size recommended by the video card manufacturer.
HP DV9700, t9300, Nvidia 8600, 4GB, Crucial C300 128GB SSD
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Windows 7/8 UEFI/Legacy mode, MBR/GPT

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White Screen when entering UEFI Settings

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