By "won't do anything", I assume that it won't even click?
IF SO-
1. Check the fuse even though there's no reason it should have blown.
2. It sounds like the attachment switch might have gotten knocked awry?
If you look at the schematic in the owners manual (page 29/56), trace the WHITE wire from the S terminal of the key switch.
It goes through the clutch brake switch, then the attachment switch to the SMALL terminal of the starter solenoid.

As a quick test, simply jumper 12V to the small terminal of the solenoid. IF it cranks, the problem is in the circuit I described.

IF you don't have an OM, click the link.

Here is a link that might be useful: OM

Hi,
Thanks for your quick response!! I sure hope this can be fixed without taking it somewhere. Yes, by "not doing anything" I meant that it doesn't even click.
He had already done the solenoid test you suggested, soooo that means it's in the circuit you described. He has just looked at it in the schematic & tomorrow he will make sure it's right. He's wondering why jamming the blades would cause that....could it have fried the ignition switch?
Anything else it could be, while you're thinking?
:)

Are you SURE he tested the solenoid that way?
Usually, people just jump the 2 LARGE terminals together.
The only difference is, that method doesn't test the solenoid.
Using both methods can pinpoint a bad solenoid though.

Yes, he jumped it using the 2 large terminals, you're right. So tomorrow he's going to check the other method.
Thanks again!

Can anyone help? I have a Craftsman riding mower 42 inch mowing deck. I last used he mower a week or so ago and when I tried to use it today, the engine started, but the clutch would not engage. I put the gear shift into forward, release the clutch/brake and nothing happens. The engines runs fine. What could be the problem?

Pete, please start a new thread of your own so we may address your problem.
In your thread be sure you state the Sears technical model number of the tractor (find it in the cavity under the seat).
The number usually is 917.xxxxxx (x being unknown numeral).
Nothing happens in the real world without critical numbers.