reboot and select propper boot device

[Jabibi]

recently i took apart my pc build to replace parts,when i found out my current build was outdated and i need to get an entire new build to work with my new parts
when i reasembled it and booted my old potato back (gigabyte amd btw)
it says "reboot and select proper boot device or insert boot media in selected boot deviceand press a key"
pressing a key justs pastes the same message
how do i fix this
in simple terms please,im not a genius

[Omega]

It doesn't have anything to boot from. Install Windows or make sure the drive is detected in BIOS.

Also what did you do exactly? You build a new PC or something? The OP is quite unclear.

[Washell]

It's not finding your harddrive with the OS. Check whether you connected both the power and the data cables to it, at both ends.

[Dr.Shadowds 🐉]

Omega eredeti hozzászólása:

It doesn have anything to boot from. Install Windows or make sure the drive is detected in BIOS.

Also what did you do exactly? You build a new PC or something? The OP is quite unclear.

Washell eredeti hozzászólása:

It's not finding your harddrive with the OS. Check whether you connected both the power and the data cables to it, at both ends.

Yes, you can't boot into the OS, if there's no OS to boot into in the 1st place, meaning it didn't find your SSD/HDD that has the OS install on it, make sure all cables are plug into the SSD/HDD properly for both the power, and Sata cables.

[Jabibi]

Omega eredeti hozzászólása:

It doesn have anything to boot from. Install Windows or make sure the drive is detected in BIOS.

Also what did you do exactly? You build a new PC or something? The OP is quite unclear.

bit of a long story
like i said im pretty dumb when it comes to pc
i thought i could fit my current build with a AB350M motherboard and a ryzen 1600
but i soon learned most of the components on my current build wont work with it
eg new motherboard doesn't support ddr3 ram cards

so i gave up,set my new componets to the side and tried to put my current pc back to its previous condition before i dismantled it
it was a pain but i think i did it but then it showed "reboot and select proper device or insert boot media in selected boot device and press a key"

this is the dumbest mistake i made this month

on another note i didn't build this pc,it was a handmedown from my older brother

[Dr.Shadowds 🐉]

Watch this video, as it will show you how easy to do this.
https://www.youtube.com/watch?v=D-NQibvg3vA

How many HDD, and SSD do you have?

[Jabibi]

Dr.Shadowds 🐉 eredeti hozzászólása:

Watch this video, as it will show you how easy to do this.
https://www.youtube.com/watch?v=D-NQibvg3vA

How many HDD, and SSD do you have?

oh my god thank you
i found the problem
because of the poor cable management in the pc i didnt realise the cable that is supposed to connect to the motherboard was hiding in a tangle of wires
im gonna try to boot the pc asap