Hi Bev,

I think it does matter what computer you are at. Those 10-15 seconds to Mint logo would suggest you have a UEFI boot enabled and you probably should be looking for "bios" config button rather then boot device selection menu.

Some uefi are real pain when it comes to changing the boot device. I even had a laptop that didn't have a boot menu as we all know it.

I was going to suggest here try using F10/F12, but...
With some devices you'll find that to get the F10 you must hold Fn first. Sound, brightness, connectivity are more popular recently than the good old F-keyes.

Good luck
Bart

Bev Nicolson <lumos@gmx.co.uk> napisał(a):
> Now googling to find out what to press to get to the boot menu usually
> brings up suggestions to hit the shift key. I keep trying this but am
> not having any joy. Esc doesn't get me far either. Do I simply need to
> keep trying or are there any other options? Does it make a difference
> that I'm using a laptop? I get 10/11 seconds till the Mint logo appears
> if that's any help.
>
> It's all rather frustrating.
>
> Thanks in advance.
>
> Bev
>
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