Need help, I bought a new computer from the local computer shop

[L0oniX]

1. hrmmm

3.8.4 Changing the Default Boot Device During POST ...hmmm gives ref to: Exits the menu and boots according to the boot priority
defined through BIOS setup ...then I see this which indicates you don't want to use F10 cause it will slow boot time: 3.9.2
BIOS Boot Optimizations Interesting that you can make it boot so fast it may not see a hard drive:

NOTE
It is possible to optimize the boot process to the point where the system boots so
quickly that the Intel logo screen (or a custom logo splash screen) will not be seen.
Monitors and hard disk drives with minimum initialization times can also contribute to
a boot time that might be so fast that necessary logo screens and POST messages
cannot be seen.
This boot time may be so fast that some drives might be not be initialized at all. If
this condition should occur, it is possible to introduce a programmable delay ranging
from zero to 30 seconds by 5 second increments (using the Hard Disk Pre-Delay
feature of the Advanced Menu in the Drive Configuration Submenu of the BIOS Setup
program).

Visual BIOS Setup Display Areas - Boot so you can't set the first boot device to your SSD? If you have and it's not booting then I would check out its spec for init time. Maybe fast boot is too fast for it? Without seeing the bios menus that's about all I can come up with. Good luck.