Here's a link to the STOP error: http://aumha.org/a/stop.php#0x21a
And here's another one: http://www.osronline.com/ddkx/ddtools/bccodes_45uv.htm
Can you get into Windows on that system? If so, you can try and delete any recently installed software/drivers to see if this frees it up. One common cause of this type of error is malware - if you can run a scan on the system I'd suggest that also. Here's a free, online scan: http://safety.live.com
A STOP error like this isn't typically indicative of a hard drive failing, but rather it's a software issue that needs to be resolved before Windows will allow itself to run. Unfortunately without knowing exactly what's causing the software problem, it's difficult to fix it without drastic measures (such as a system restore). Replacing the hard drive will fix it tho' - because you'll have to reinstall the OS on the new hard drive, thereby bypassing the software issues with the old installation.
FWIW - you can download a bootable hard drive diagnostic from the website of the hard drive manufacturer and boot from it to test your hard drive without using Windows.
My browser caused a flood of traffic, sio my IP address was banned. Hope to fix it soon. Will get back to posting as soon as Im able. - John
(my website: http://www.carrona.org/
)**If you need a more detailed explanation, please ask for it. I have the Knack
. ** If I haven't replied in 48 hours, please send me a message. My eye problems have recently increased and I'm having difficult reading posts. (23 Nov 2017)FYI - I am completely blind in the right eye and ~30% blind in the left eye.
<p>If the eye problems get worse suddenly, I may not be able to respond.If that's the case and help is needed, please PM a staff member for assistance.