NOTHING Happens When Trying to Start?

Bought myself a 2003 Saturn L300 back in late 2014, ran like a charm until around August / September 2015.
In September it didn't seem like anything too serious, the car would have a rough startup, would either get lucky and it would start on the first two tries.. or I would have to keep the key in the "Run" position for 5-ish minutes and then start it up to work. Friend told me to replace the fuel injector - did, next he told me something about the key sensor - got that replaced too. Worked fine for a few months.
January came around and same issues, just a harder start. Would have to either let the vehicle sit or continue to turn it from "Off" to "Start" until it started.
That lasted until April 1; on April 1 my car ALMOST started, but then the lights dimmed.. (dashboard), then when I turned it to "Run" the lights (dashboard) would flicker quickly. Then powerlocks went out, after a while NOTHING happened when I put my key in the ignition. Any ideas what is could be?
296k miles.
Tried jumpstarting, nothing.

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Answers
Seriously, you need to have someone who knows what they are doing take a look. It could be a number of things. In any event, I wouldn't spend a lot of money on it.