I was using my computer, playing games, using Chrome, etc. But then suddenly it freezes. I turn my computer off and then I turn it back on. It stays on the TOSHIBA screen for a bit, then it goes to black. It then shows "Checking Media...". It then says " Check Media Fail No Bootable Disk Please Restart System". I tried everything I have found, but none of them seem to work. I had the computer for about 3 or 4 years. Is there anyway I could fix this? My computer model is Satellite C855D-S5320.