Watch where the water comes out and goes into the bowl. There are about 50 or so holes to allow that water to flush. If they are restricted, it will impede the flow. Take an ice pick or nail and poke each one of the holes. If you feel any that are blocked, that may be your problem.
Source: I learned this from a plumber.
Rather than the typical lever style flush handle, a push button toilet has a button on top that when depressed operates the flushing mechanism. This is a page about fixing a push button toilet.
Determining the source of the leak is the first step in making the repair to a leaking toilet. This is a page about repairing a leaking toilet.
Repairing and replacing some parts on a toilet are simple homeowner fixes. This is a page about rubber flapper in toilet will not close after flushing.
If there is water accumulating around the base of your toilet, the wax ring may be damaged and need replacing. This is a page about replacing a wax toilet ring.