2003 Dodge Neon Possible Headgasket Problem

I have a 2003 Dodge neon and I had some starting issues a few weeks back and once I got it started it ran alright, and still had the power. I parked it and went to leave the next morning and it wouldn't start. It is getting fuel and spark, timing belt is not broken. Only problem I can see is it is dry on water and there is no visible exterior coolant leak. I pressure tested the colling system via the rad cap and the tester held the 16lbs that its supposed to and it doesn't seem to have water in the oil but the water is going somewhere. Should I tear it down and check the head for cracks or what should be next step?