help me pls

[Alvin The bad keyboard]

hi! i recently got a new case to my pc and trancfered all the old hardware to the new case. when i booted the pc in the new case i got an error. "windows wont boot". i resterted the computer and after that it said "no bootable harddrive". i have one ssd and one hard drive. the ssd has the windows 10 files on it so i figured it most be somthing with the ssd. i shecked the bootorder in my bios and the ssd didnt pop up. it only said i had a harddrive. i turned of the pc and tried to change sata cabel. nothing worked. then i realised that i had a bootable usb stick that i had lying around from another build. i putted that in and it said same error as the first time "WINDOWS WONT BOOT". I THENE got on my mac (the only working computer i got for the movement) i cleared the usb and then made it ready to download new windows 7 files to the usb flash drive from a mac so i could boot with new files. i have a old mac so i couldent do the windows 10 or 8 wearsion of windows so i realised that i gotta doawnload the windows 7 file and then upgrade it once on my pc to windows 10. i had to do a little bit off change in the code of boot assistant on mac to make it so i could make a bootable usb flash drive from a mac. i spent a lot of time trying to fix this ishu but when i thene go to kinguin to buy my windows oem key and thene put the windows oem key i got from kinuing to the microsoft iso download website it says that i need to wait and try again later. WTF IS THAT MICROSOFT SHIT. i only want a windows 7 iso file. pls help did i buy worng sort of key from kuinguin and do i need to buy another one?  and also could my ssd be destroyed? are al my files gone from the ssd? this worries me. it also said that the front io conectors was a error and i dont know how to put theme in because my mother board is a dell one so dont say how to put theme in. it also said it was somthing wrong with but clearly the fans was spinning. pls pls pls i need help. i dont want to buy another key.

[Majestic_Koala]

12 minutes ago, Alvin The bad keyboard said:

hi! i recently got a new case to my pc and trancfered all the old hardware to the new case. when i booted the pc in the new case i got an error. "windows wont boot". i resterted the computer and after that it said "no bootable harddrive". i have one ssd and one hard drive. the ssd has the windows 10 files on it so i figured it most be somthing with the ssd. i shecked the bootorder in my bios and the ssd didnt pop up. it only said i had a harddrive. i turned of the pc and tried to change sata cabel. nothing worked. then i realised that i had a bootable usb stick that i had lying around from another build. i putted that in and it said same error as the first time "WINDOWS WONT BOOT". I THENE got on my mac (the only working computer i got for the movement) i cleared the usb and then made it ready to download new windows 7 files to the usb flash drive from a mac so i could boot with new files. i have a old mac so i couldent do the windows 10 or 8 wearsion of windows so i realised that i gotta doawnload the windows 7 file and then upgrade it once on my pc to windows 10. i had to do a little bit off change in the code of boot assistant on mac to make it so i could make a bootable usb flash drive from a mac. i spent a lot of time trying to fix this ishu but when i thene go to kinguin to buy my windows oem key and thene put the windows oem key i got from kinuing to the microsoft iso download website it says that i need to wait and try again later. WTF IS THAT MICROSOFT SHIT. i only want a windows 7 iso file. pls help did i buy worng sort of key from kuinguin and do i need to buy another one?  and also could my ssd be destroyed? are al my files gone from the ssd? this worries me. it also said that the front io conectors was a error and i dont know how to put theme in because my mother board is a dell one so dont say how to put theme in. it also said it was somthing wrong with but clearly the fans was spinning. pls pls pls i need help. i dont want to buy another key.

Have you connected the SATA cables into the correct port? Because the BIOS should recognise the SSD, maybe you damaged it after taking it out of the system?