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strange bios behaviour

Last Modified: 2016-08-28
i have a HP probook 450 works fine with windows 7.
however the client wants windows 10 - so i installed  a  SSD 500 Gb with the windows 7 image on it and proceeded to set up from flash drive.  it started setup but gave the error when you see the drive and partitons: cannot create partition"
so i rebooted - to delete ALL partitions, except HPTOOLS and RECOVERY and all of a sudden it Always booted into HP diagnostics - whatever key you hit during startup
so i deleted the 2 remining partitions  -  still the same problems - it would NOT boot form disk or usb -  i only got in the HP diagnostics

HOwever, when i installed the disk with a windows 7 or windows 10 (that was upgraded from windows 7) i got a normal boot, and could access the bios in the normal way with all keys

so it looks like there is some bios or boot info on the disk - influencing the bios access

does anybody see this?
does anybody know why it happens ?  or how to fix this (other than installing an already bootable drive that is) ?
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