My disposal just hums. It doesn't seem to be jammed, and the reset button doesn't fix it. It rotates in both directions freely when using the Allen wrench. I noticed also that the PVC pipes were corroded and leaking at the joints. I had a renter who admitted that he poured latex paint down the drain after a paint job. Would that have ruined the disposal? What's the best type to replace it with if I need a new one? Thanks very much!

sounds like bad brushes in the electric motor. on most unit hard if not impossible to replace.

Sounds like the starter winding is bad.
The cutter disc is welded directly to motor shaft. So is the allen wrench fitting.
So if disc rotates freely, then you should be able to feel the allan wrench fitting rotate too.
Use broomstick instead of hand down disposal.
If motor hums and cutter disc does not spin, but cutter disc can be moved freely, then disposal needs to be replaced.
I wish they made repairable motors so that metal and copper doesn't get thrown into the scrap recycle metal bin.

I wrote ez disposal replacement tips:
http://beta.fixya.com/support/r7929008-replace_garbage_disposal

Put a wood broomstick down in the opening, or use allen wrench on bottom of motor, and see if you can free up the cutter disk.
You want the disk to rotate freely.
Then use vacuum cleaner hose to make sure all the small stuff is removed.
If the disk rotates freely, but continues to jam, then you probably need to replace disposal.
I wrote ez disposal replacement steps from when I worked apartment maintenance.
http://www.fixya.com/support/r7929008-replace_garbage_disposal

Put a wood broomstick down in the opening, or use allen wrench on bottom of motor, and see if you can free up the cutter disk.
You want the disk to rotate freely.
The use vacuum cleaner hose to make sure all the small stuff is removed.
If the disk rotates freely, but the motor will not start, and the motor just hums, then motor winding has gone bad, and motor is overheating each time it hums. Replace disposal.
I wrote ez disposal replacement steps from when I worked apartment maintenance.
http://www.fixya.com/support/r7929008-replace_garbage_disposal

You need a new disposal.
Free-rotating blades show there is no obstruction.
Humming says you have power.
Frozen allen wrench says bearings are rusted.
Motor is now overheating each timer electricity is turned on, and motor will overheat and stop humming.
At least the drain is clean and water is not flooding under the sink, which means you can continue using sink until disposal is replaced.

I wrote tips for installing disposal from days when I worked apartment maintenance:
http://www.fixya.com/support/r7929008-replace_garbage_disposal

Glass can certainly jam it. There is spot in the center of the bottom of the disposal where you can insert an Allen wrench to turn it by hand. Try turning it backwards to free jammed material. Then with power off, take a flashlight and look inside to see if there is anything in the disposal. You can use tongs or long needle nose pliers to remove glass or other obstruction. It should spin freely with the allen wrench. If it hums too long the overload will trip. You can reset it by pushing the red button on the bottom back in. GOOD LUCK! Let us know if this helps!

Be aware that your selected object you have a problem with is a hot water faucet made by insinkerator, not a disposer. I'm not sure what your problem is, but let's try to address the most common problems.
The disposer must be turned on and run to get rid of food. Does the motor come on when you turn it on? If it doesn't, does the disposer make a humming sound when you turn it on like it's jammed? If it makes no humming sound when you turn it on, first press the reset button on the bottom firmly. If the disposer then makes a humming sound, it's jammed. Read below. If the disposer still doesn't act like it has power when you turn it on, check the circuit breaker or fuse and try the reset button again. If none of this so far works and you still don't even hear it making the motor-stalled-buzzing-sound (open the cabinet door) then you should still check the disposer to see if it's jammed.
First, make sure you TURN OFF THE POWER to the disposer with the circuit breaker or fuse box. Now you need to check if the shaft rotates freely. On most disposers, there's a hole in the center of the bottom of the unit. You can insert a special disposer wrench or allen wrench into this hole and turn the shaft of the motor. It should rotate freely. You'll probably find the disposer wrench taped under the sink, or you can pick one up at a hardware store. If the disposer doesn't have this hole on the bottom, you need to go from the top. Remove the splash guard (black flappy thing) if it is removable on your model. Look inside with a flashlight for anything foreign that may be causing a jam like bottle caps. Place a broom handle against one of the lugs mounted on the wheel, and see if the wheel turns freely. If it doesn't, try to work it back and forth until it does. Then use tongs to remove the foreign object. After you clear a jam, it may be necessary to push the reset button again. If the motor became overheated it may take it as much as like 20 minutes for the motor to cool enough to allow you to reset.
Be aware that food usually needs to be pushed into the disposer manually, with a full flow of cold water.

12 years is middle aged for an appliance, but the problem is probably one of the garbage disposal big three: a tripped circuit breaker, a tripped reset button, or a jammed disposer. With the breaker turned off, make sure the disposer's shaft rotates freely. On most disposers there's a hole in the bottom middle where you can insert an allen wrench that you're probably find under the sink and rotate the shaft manually to free jams. But, for the love of God, only do this with the breaker turned off and make sure you remove the wrench (or broom handle if you have to go from the top) from the disposer before turning it on. Make sure the reset is pushed down until it clicks if it's tripped, and, since circuit breakers get old and stick, you'll have to turn the breaker all the way off and back on to make sure it's not tripped. If the disposer hums but doesn't turn when you turn it on, check to see if it's jammed. If it turns freely but hums and doesn't start then the starter circuit on the motor is bad. If the breaker and reset button are ok and it doesn't even hum when you turn it on, you'd want to check the disposer to make sure it's getting power. You can find a little electrical reader at walmart for $5 that works like a geiger counter and will beep when it gets close to something that's receiving power. The switch may be worn out, but really the disposer's motor failing is probably the least likely thing. But please get a qualified electrician out there if you don't know what you're doing. There's a reason that it requires a license.

Try turning off the circuit breaker and turning it back on, pushing the reset button firmly on the bottom of the disposer, and checking to make sure it's not jammed and rotates freely. If it is jammed you can put a disposer wrench or allen wrench in the hole in the bottom and rotate the shaft to free it. There might already be a wrench under your sink for that.

The badger 5 has a dislodge device on the bottom right in the very center. An allen wrench will fit if you have lost the tool that came with it.

FIrts you will need to dislodge anything preventing it from turning. (Insert the right size allen wrench and turn both directions) The remove whatever comes loose after dislodging.

Then opush the red reset button on the bottom. Check the breaker that powers up the disposal, as you may have tripped it.

If the breaker is on, the unit is turning freely, and the reset button is pushed, then the next step is to check for power using a volt meter, to make sure the disposal is indeed getting power. If all the above has been done, the unit IS getting power then yes, the disposal needs to be replaced.