If your PC does not boot and stays with the splash screen:

That probably means your SATA connector is not properly connected.

You can follow the steps:

1 Put off the SSD and the Black plate for SSD of the PC

2 Open the back of the PC (4 black screws in the corners)

2 You will see the SATA connector as the photo below:

4 Take it off and put it back, be careful, this is really sensible.

5 Screw back the 4 screws and the plate.

6 Try the PC.