Is it the battery, alternator, starter or something else?

My car turns over but it doesn't start it sounds like it wants to start but it doesn't. The lights come on as well while trying to start the vehicle (the check engine light, the oil light, the battery light, od off light,). I dont have money to get a diagnostic test and fix whats wrong I only have enough to... show more My car turns over but it doesn't start it sounds like it wants to start but it doesn't. The lights come on as well while trying to start the vehicle (the check engine light, the oil light, the battery light, od off light,). I dont have money to get a diagnostic test and fix whats wrong I only have enough to fix what's wrong so I'm just trying to weed out the problem. Thanks
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