After flushing the toilet, no water came into the tank. I've checked and my water is not shut off at the valve or anywhere else in my house?:eek:

This could be one of the things that might cause this. You may have a FluidMaster Valve, it is grey with a black cap. There is a small diaphragm inside that needs to be replaced, you can get them at almost any hardware store, it will have instructions with it. Now this only works if you have a Fluid Master Ballcock # 400.