HELP!!! 1992 Maxima won't start!!!
 

I just got this car a week ago, and it no longer wants to start. it doesn't turn over or anything. I took it to a mechanic, and he replaced the starter. 2 days later, it stopped starting again. 3 different mechanics have told me that they "think" it is the starter, but i have heard that there may be a problem wiht the CRANK ANGLE SENSOR or the ECCS Relay. I am sick of misdiagnoses, because i find it hard to beleive that i got 2 bad starters, and if anyone could help me troubleshoot what it is, that would be great.