that error usually means a hard drive failure.
i'm curious but how did you notice your pc was running "faster" ?
and why did you need to reset the bios to factory settings if you hadn't changed anything in the bios to cause it to run "faster" in the first place?
by the way it's called "overclocking" and i don't think it is the cause of your problem, unless of course you removed the hard drive from the boot order when in bios, but could be.
does make me also wonder what else you may have done but not told us about tho.
back to your problem/hard drive failure.
things i'd check to confirm there is a problem with the hard drive.
1:- go into your bios and see if it is showing up there, and hard drive is also listed in the boot order, if it isn't even seen then that would more or less confirm it's totally failed (but not the only reason could be motherboard problem/failure.).
2:- download and create a live linux cd and boot it, this will check everything else works correctly and also you can check to see if the hard drive shows up in that os and is searchable.
with luck so far your hard drive does show up in bios, and can also be seen and accessed with the live cd,
this would point to the reason for the error as your boot loader being broken and should be able to be easily fixed without you loosing anything.
instructions will be give later on how to do this if needed.
hard drive not seen in either bios or with live cd then last option i'd try is.
3:- open the laptop hard drive compartment and remove and refit it, just to check it hadn't worked loose and is firmly connected.
if still no joy then the only real solution to the problem, if the hard drive has failed like i believe, is to buy a new one, fit it and install your operating system to it.
Edited by terry1966, 15 November 2014 - 10:09 PM.