My hard drive light is stuck on. It's not grinding as far as I can tell.
It's not the OS; it will stay stuck on if I go into the BIOS. It turned off
after a couple hours after boot a few days ago, but now it just stays on and
I never see it blink. My performance seems to not suffer, but it worries me.

I don't think it's a cable issue, it worked normally and didn't start
staying solidly on until I threw in another (old) hard drive, but I pulled
that other hard drive out and the hard drive light was still stuck on, so I
put the other hard drive back in.

Any ideas?

Jon