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enabled secure boot in my hp z640,now i am getting 6 beeps and no display

HP Recommended
hp z640 workstation
Microsoft Windows 7 (64-bit)

was trying to install windows 10 on ssd which was showing 0 bytes,saw online suggesting to enable secure boot

changed the setting in bios or menu startup by pressing f10 to disable legacy and enable secure boot

now i get is red 6 beeps and no display,the processor and gpu fans are running,have tried resetting the cmos and battery

to reset bios .i have hp z640 workstation first time using the system

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