Lawnmower wont move in fwd or reverse

When you look at the ignition, where the key goes, there should be a little icon of a mower with an arrow. After you start the mower, turn the key to this position. If it isnt there it wont go reverse, so after starting just move the key to that position and it should fix it. Go test it now and let me know if it works!

Some mowers will not allow you to shift into reverse with the blades engaged for safety reasons. Try disengaging the blades then shift into reverse.

If its a riding mower it probably the drive belts off track or slung off. The mower will still start up and turn blades with the drive belt off, but want engage to go forward or reverse if this is the problem.

Check the safety switches, and make sure the blades are not engaged. Let me know how it goes, there is other stuff to check if that does not work.

If your transmission is a 700r4 (4l60) you have a reverse band that engages when you want to go in reverse. since it drives forward your low reverse clutch and your fwd clutch are working. This leaves the band which was probably slipping now is not engaging.

check to see if there is something caught around the blades that won't allow to turn

use higher revs,
ensure you are not in reverse
get mower moving first then once driving forward then engage blades

Sounds like sunwheels blown in gearbox...

Is the parking brake on? Or if it's a hydrostatic (automatic) there is a release lever to push the unit around when it isn't running. Most of those releases are on the back of the machine, and you just push it in for drive and pull it out to push.

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Sounds like the seat safety switch.