My PC has two 2TB HDDs. A 5+ year old Seagate HDD from my previous computer and a Toshiba HDD bought alongside my current PC.
I had been hearing the clicking noises for some time now, and finally I've gotten the "smart status bad backup and replace press f1 to run setup" screen for my old HDD. I'm not surprised since I was expecting this to happen soon anyway, but I don't really need to backup anything (I don't have any important stuff in it).
So I simply decided to unplug it, but as soon as I did and restarted the pc, it said that i had an invalid boot device selected and that I have to reselect and try again. So I'm like "???" because I was pretty sure the boot priority was set as Toshiba HDD and then DVD-RW. I thought that, by the minuscule chance, I had unplugged the wrong hard drive, but when I swapped them, the SMART bad status reappeared, so I was sure of it.
I am really confused as to why this is happening. I am absolutely sure that my OS is installed on the Toshiba drive and yet this is happening.
Oh, and if I press F1, the BIOS menu opens up.
My motherboard is an Asus P8H77-V LE.
For the time being, I escaped the problem by reinstalling Windows on the same drive partition, but I still want to know what had happened.