Windows 8 Lock Screen Stuck - Cursor / Num / Caps Lock Work

My laptop is a
Sony Vaio - Model: SVE141R11L
Product name: SVE14135CXB
Pre-loaded with Windows 8 x64
Intel(R) Core i5-3230M CPU @ 2.60GHz
6GB RAM w/ 900GB HDD space
Purchased in Navy Exchange last year (around July 2013)

I have dropped it once or twice from at most a 3ft fall inside a padded case. I mostly use my computer for school work, some gaming, extensive video/photo editing, internet browsing. I've installed some debatable programs but have been installed long ago. Most of my programs included Microsoft Office, Adobe suite, Steam, iTunes, uTorrent, McAfee VirusScan Enterprise, Winrar, VLC, etc. But are now gone due to the refresh I had just done last week for prior problems, but still experience problems.

I recently been having issues with my computer where it just won't respond at all. Like today, I had it working for a few hours, but then went out and left my laptop on the lock screen, and came back to it being completely stuck. Completely stuck as in, no keys or clicks would unlock the screen to the login prompt. However, my cursor was fully able to move around the screen, and my caps/num lock buttons work as they display the lights enabling/disabling them. The time when it was stuck was 8:03pm, but the clock was stuck on 7:55. But on the bottom of the front of the laptop, the HDD orange light is not lit up at all, which I believe suggest that the HDD is not reading/properly reading. Oddly enough, when I unplugged the power cord, the HDD light flickered a little then disappeared, still no response - could be related to the PSU I suppose?

Another problem I faced before was the Windows 8.1 update failure, resulting in reverted changes, etc. I also had problems in the first few months of owning this, but found it was the incompatibility of an old antivirus that I guess didn't work too well with Windows 8 causing me to have to do a full wipe before. That was long ago. Moreover, the problems I have been experiencing have been unresponsiveness, from what I believe, are the fast boot Win 8 provides (but I turned that off), issues with Windows 8 not being able to load drivers from sleep mode upon opening the laptop (turned off automatic sleep), and now with the lock screen being stuck. I know my problems aren't detailed, but maybe these problems are linked to a bigger similar problem that people have been facing? My last bet would be to do a full factory restore/ repair, although I don't have a Windows 8 boot CD.