Water Tank Will Not Stop Running Water

There may be something jamming the shut off control valve This is fully covered if you past this link in your browser; http://www.wikihow.com/Fix-a-Running-Toilet

The noise is because your float in the toilet is set at too high of a level and it is overflowing and making noise.
Reset your float, to adjust the water level just below the overflow pipe...this should stop your noise.
If it does not correct the problem then you will have to replace the water control unit inside of the toilet tank.
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The Kohler Cimarron is one of the most popular and reliable toilets out there. (My Favorite). However, depending on the hardness of the water and if you use cleaner tabs in the tank, these factors can lead to a malfunction.
The first thing you should do is hold the flapper (rubber seal inside the tank that releases the water down to the bowl) down with your hands for a few seconds after a flush and see if the toilet stops running. Sometimes the flapper doesn't seal properly therefore the fill valve keeps working non stop. Stopping the fill while holding the flapper down will confirm that your flapper needs to be changed.
If this doesn't work then try this....
The other common problem with a running toilet is with the fill valve itself. There is an attached float on the fill valve that goes up and down depending on the water level. Once the water level rises, it rises the float, and the float tells the fill valve to stop filling the tank. While the toilet is running (hissing), try raising the float all the way up with your hand and see if it stops. If it stops but not consistently with every attempt, then you will need to change the fill valve. I believe the Fluidmaster 400A is the replacement model.

if you can see the water running in the bowl it's a good chance that the flappers warn http://www.aplumbers.com/residential/toilet
1. tank the tank lid off.2. flush the rubber thing that comes up and allows the water to go to the bowl is the flapper 3. remove 4. replace that should fix it.
problem 2
1. tank tank lid off.2. if the waters flowing over the long tube in the center and down then the water level is too high3. adjust the level either it will have a ball **** or a float in either case   a ball **** adjusts by a screw on the fill valve. the float has a either a metal rod w/ a pinch clamp or a plastic long screw type thing.4. adjust water level .5. barely lift handle to allow a little water out til fill valve kicks on then release handle til valve stops .6. just keep re adjusting til you get the water level right there should be a molded in line for the level on the back of the tank.

(Problem 1) if you can see the water running in the bowl it's a good chance that the flappers warn. you'll have to look at the angle where the light hits the water. The water will be rippling where the top of the water meets the inside of the bowl edge.
For more info on how a toilet works = http://www.aplumbers.com/residential/toilet
solution 1
1. tank the tank lid off. 2. flush, the rubber thing that comes up and allows the water to go to the bowl is the flapper 3. remove 4. replace that should fix it.

problem 2 it could be the water levels to high.
(solution 2)
1. tank tank lid off. 2. if the waters flowing over the long tube in the center and down then the water level is too high 3. adjust the level either it will have a ball **** or a float in either case a ball **** adjusts by a screw on the fill valve. the float has a either a metal rod w/ a pinch clamp or a plastic long screw type thing. 4. adjust water level . 5. lift the flapper to allow a little water out til fill valve kicks on then release handle til valve stops . 6. just keep re adjusting til you get the water level right there should be a molded in line for the level on the back of the tank.

Change your Ball ****...(Water inlet Device)
You can also make sure that the water level is not set too high in the tank and overflowing into the overflow tube...if it is try to readjust the float to seal the water from getting into the tank. If you cannot readjust the float to stop the water from entering the tank then you must replace the Ball ****.
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probably the flapper valve is not seating correctly over the outlet. you can fix it by reaching in and twisting the valve one way or the other till it seats properly and the leak will stop.

WATER LEVEL IS NOT PROPERLY ADJUSTED. REDUCE WATER LEVEL TO FILL LINE

If there is always water running into the toilet bowl, replace the tank ball. That's the stopper at the bottom. If you can lift the float and stop the water, either replace the sealing diaphram at the top of the ballcock (float valve) or replace the whole unit. Some are not repairabe.