I have had this system for years and have had some problems over time. My specs are as follow:
 
i7-920 @ stock settings
evga x58 e759 classified
gtx 560 ti 448 classified
6gb kingston hyper-x
some hard drives and other misc stuff
 
Recently i've noticed nothing wrong with my pc other than the cold boot issues it has had forever. Recently however i've been getting a BSOD from time to time. The number is very long and ends with 0's followed by 51. What i don't understand is that this BSOD does not get recorded in event viewer anywhere. The only BSOD i have ever seen before was related to Vcore or VTT when i was overclocking. I never really felt the need to keep my pc overclocked because all i really do is play dota 2. However everything is at stock settings and i've recently been seeing BSOD 51 more frequently. Now it sometimes happens before windows even loads (after i type my password in). As of today this problem has virtually rendered my PC useless and being a poor college student, building a new PC is not an option currently.
 
I've tried running bare bones and the problem still exists. Does anyone know what this BSOD is? i haven't the foggiest where to start and hope i can make my pc usable again in the near future.