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Can't access BIOS

HP Recommended
Workstation Z230
Microsoft Windows 7 (64-bit)

Hi. I made some changes to the BIOS to get my workstation to boot from a USB.

Now the machine won't boot at all and I cannot no longer access the BIOS.

I have tried different keys on power up -  [Esc], [F10], [Windows] + [B], [WINDOWS] + [V] but nothiong works.

What happens now is that I get a blank screen on power up and after about 35 seconds the cooling fan goes full speed.

Can anyone help?

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