Which engine: 2.7 or 3.2?
Could be a million causes, but have to start somewhere.
If 3.2, how many miles and years since last timing belt/water pump change? If never been changed, your timing has likely slipped or belt broke.
Disconnect the cam sensor connector and see if it will at least start and run up to 2500 rpm. If it starts then, then timing belt has likely stretched or slipped a tooth or two.
If still no start (with cam sensor disconnected), then there are still many possibilities to pursue, including certain fuses. But let's start with what's been suggested so far and see what the results are.
'98 LXi - Later Concorde gages (black w/ chrome rings)/'99 LX - LHS gages (white) - HIR bulbs