Will not start will crank good

The low oil pressure light came on, stayed on, then it started not getting fuel off and on. Then after I drove it to town it would not start any more, The on board computer sit has low oil pressure, I then checked the oil pressure with a manual gauge, read no oil pressure. I did check oil and for leaks no problems. I have replaced the oil pump, timing chain set, now it has 52 lbs of oil pressure, it still won't start, cranks, no start. The low oil pressure light is still on, I have tried clearing codes and computer, still won't start. What else can I do?