Hello" I replaced shift cable , H2 Hummer 03" gear shift great now...lol..Transmission not turning....Help

SOURCE: my 2003 h2 hummer will initally not shift from

Check the linkage that goes from the shift lever down to the transmission. It sounds like somewhere along the line, it has become disconnected or has broken.
if that parts are clean then It sounds like you have a shift control solenoid that has high resistance causing the hard shift you describe. Scan the PCM for trouble codes if none are present you could have a internal transmission problem.

SOURCE: Hummer H2 2003, shifting problem

Yea, hummers are notoriously unreliable. They are gas gusslers too.
I'm assuming this is an automatic?
When the transmissions computer detects any malfunctions, it will give you a check engine light, or something along those lines.
Do the normal checks such as checking the transmission fluid level as per the user manual.

For further diagnostics you'll need to take it to a mechanic. It's impossible to diagnose a problem like this without driving the car and being able to reproduce the problem.

SOURCE: Hummer H2 engine won't turn over, key won't

Dead Battery? Bad starter motor?

Try pushing on the brake and making sure its all the way in park.

Turn the steering wheel back an forth a little to remove the key.

None of those work, Call triple A, find a shop.

SOURCE: 2003 h2 hummer transmission will not shift out of first gear

if you changed selinoids i hate to say it but i think its toasted. but before dropping the cash on a new ****** i would go to the nearest chevy dealer and have it put on the computer. this way if when they update your software it doesnt fix the problem you need a ****** shop.
my hummer set for nearly six months and when i started driving it again i thought my ****** was toast, it would go through all the gears but slipped like no other, i went online and bought a superchips programmer and all was well again. somtimes the computer just needs kicked in the ***!