What causes 2000 sebring not to fire?

Any time an engine doesn't fire it will ALWAYS be because of one or more of the following problems: Compression, ignition or fuel delivery. Start with fuel, since that's easiest. Use a little starting fluid to see if you can get it to fire a little. If it runs with starting fluid, you know it's a fuel delivery problem. If that doesn't tell you anything, try the ignition. Pull a spark plug wire then connect it to a spare sparkplug and lay the sparkplug on a solid metal part of the engine block. Crank the engine and have a helper watch the plug to see if there is a nice, strong spark. If you have good spark, next run a compression test. If the compression is consistently low across all engines, you have probably slipped a timing belt. Once you have it narrowed down, you can start looking at that specific system to see what needs to be done to solve the problem. If you would like, you can e-mail me directly to further narrow down and solve the problem.