1997 Chevy Blazer Blazer not starting

I have a 1997 Blazer. I turn the key to start it up and it turns over, but will not fire and start. I replaced the spark plugs, distributor cap, spark plug wires, fuel filter, and put water out and fuel injector cleaner in the gas tank. After I did so, the Blazer turned over a couple times and then started on the third try. When I tried that third time, I noticed that the lights on the instrument panel lit up before it actually started. I drove it around the block a couple times and then parked it and turned it off. I came out a half hour later and it started again and I thought the problem was fixed. But, when I came out the very next day, it wouldn't start again. I noticed that the lights on the instrument panel were not coming on again and it wouldn't start again. By the lights on the instrument panel I mean check engine, abs, oil, and all the lights that usually come on, but then go off once started. Could this be an electrical or computer problem, or does it sound more like ignition switch problem? Please help!