|If the pc wasn't moved or disturbed then the hdd is bad but first take a look inside. Make sure connections aren't loose(sata data & power cable), make sure sata data cable is straight, swap both data and power cable, make sure sata is enabled in your bios, use different sata ports. If it doesn't work it's a paperweight(nothing u can do). Next time enable S.M.A.R.T|
We can not fight new wars with old weapons, let he who desires peace prepare for war - PROPHET.