"Reboot and Select Proper Boot Device" getting error

[sxyadii]

Last night,my pc was running fine but now I m getting this error

Reboot and Select proper Boot Device
or Insert Boot Media in selected Boot Device and press s key

Need help....

 

[saqib_khan]

Check in BIOS, which is your first boot device. See if everything is correct there. Else fit the cables of hard disk and DVD drives.

 

[coderunknown]

Last night,my pc was running fine but now I m getting this error
Need help....

bus cable got loose. pull it out & reattach it. both in hdd & mobo. should work fine.