HP Pavilion 15 will only boot using legacy option in BIOS

[DB1296]

After replacing my son's broken HDD, I installed Windows 7 which I then upgraded to Windows 10.  I find that the laptop will not boot unless the Legacy option is enabled in the BIOS.  If I turn off Legacy option it won't boot and I get the message "Boot disc not found".   This may have been like it before his HDD was replaced but I'm not sure.  There is no reason to want to boot from UEFI (as it boots up OK using Legacy) except the legacy option seems slow.  Any comments gratefully received.

[Paul_Tikkanen · Accepted solution]

Hi:

If you had W7 on the notebook before, then Legacy mode would have to have been enabled.

I believe you have to install W10 in UEFI mode.   You can't just switch the settings.

Then I also believe you will get an error that states in substance...windows can't be installed to this disk because it is MBR, and you need to convert the disk to GPT.

Now as far as booting time, I don't know why UEFI would boot faster, but perhaps it does.

The main advantage of UEFI is for those folks that use drives greater than 2 TB to be used as boot drives.

Otherwise, there are no major differences (unless you are right about the faster boot time).

There are some tips and videos for how to install W10 in UEFI mode...

https://www.youtube.com/watch?time_continue=13&v=gFbg1Q7a7yo

[DB1296]

Thanks for your prompt reply.   I am only guessing the UEFI boot will be faster.  As my son's HDD is only 1TB I will choose to leave it booting in Legacy mode as I don't want to erase his programs and data.  The video link you mentioned is very informative and I shall save it for future reference should he need to do a clean install of Winndows 10, when I will take the opportunity to do the installation in UEFI mode.

[Paul_Tikkanen]

You're very welcome.