This happend a couple of years ago to my friend's PC, I think that got us going on the road to becoming techs
My friends hard drive packs it in and dies so he takes it into the shop and he has to wait two weeks for his PC
Well two weeks later he gets it back and promptly starts hooking it up and to his surprise the modem caves in ( they forgot the ancher screw )
Well to get the phone cord off he has to pop the case off ( No crowbar )
He finds the cpu fan unhooked and the modem wrecked the sound card
Well the system went back and they fixed it up and replaced the modem
and a few months later he "lost" the drive again so he replaced the drive
A year later when I put a drive into it for backup I found that the ribbon cable was on backwards at both ends
grrrrrrr !!!
Well that system has never been the same and e remember to put the screws in

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Format c reboot,reboot,reboor,reboot )